Method and system for mobile communications

ABSTRACT

When a network pages the temporary user mobile identifier of a mobile station, the mobile station sends a response to the network. Next, the network checks the authenticity of the user using a ciphering key, corresponding to the temporary user mobile identifier and a random number. If the temporary user mobile identifier is authenticated, a normal incoming call acceptance procedure is executed. If the mobile station is authenticated although the temporary user mobile identifier is wrong, the network reassigns a new temporary user mobile identifier to the mobile station and stops the current communication. In communication, the network and the mobile station mutually notify encipherment-onset time and negotiate about encipherment manner with each other. In addition, diversity handover is commenced upon a call attempt. Furthermore, if a branch replacement is necessary, the current branch is replaced by new branches capable of executing the diversity handover. Additionally, when a new call occurs to or from the mobile station capable of treating a plurality of calls simultaneously, the mobile station uses the same branch structure and the same communication frequency band for all of calls. Additionally, when a new call occurs to or from the mobile station capable of treating a plurality of calls simultaneously, a branch structure and a communication frequency band, which can continue all of the calls, are selected and used. Therefore, the mobile communications system is suitable for transmission of various sorts of data in accordance with the development of multimedia.

TECHNICAL FIELD

The present invention generally relates to a method and system formobile communication and especially relates to a method and systemadopted to transmission of various sorts of data in accordance with thedevelopment of multimedia.

BACKGROUND ART

Conventionally, portable telephones have been widely spread, and TDMA(time division multiple access) and FDMA (frequency division multipleaccess) were used for access methods for portable telephones. In thesedays, CDMA (code division multiple access) is being adopted instead ofTDMA and FDMA because of various merits, such as high efficiency atusage of frequency band, facility of change of transmission rate, andpreservation from eavesdropping.

However, CDMA according to prior art is prepared mainly for voicetransmission and therefore is not suitable for data communication. Inrecent years, as the development of multimedia, not only voice but alsovarious kinds of data that can be processed in computers and so onshould be transmitted. Therefore, communication access between mobilestations and network should be suitable for transmitting various typesof data in the near future.

DISCLOSURE OF INVENTION

It is therefore an object of the present invention to provide a methodand system for mobile communication suitable for transmitting varioustypes of data in accordance with the development of multimedia.

The present invention provides a method for mobile communication carriedout among a plurality of mobile stations and a network, personalidentifiers being previously and respectively assigned to the mobilestations, the method comprising the steps of: assigning temporaryidentifiers respectively to mobile stations which are communicable withthe network; storing the personal identifiers and the temporaryidentifiers of the mobile stations by the network; storing the personalidentifier and the temporary identifier of each mobile station by themobile station; detecting by the network that one of the temporaryidentifiers stored in itself is different from that stored in thecorresponding mobile station; and reassigning by the network anothertemporary identifier to the mobile station of which the former temporaryidentifier stored in the network is detected to be different from thatstored in the corresponding mobile station.

By virtue of the above invention, it is possible to provide a method andsystem for CDMA wireless communication suitable for transmitting varioustypes of data in accordance with the development of multimedia.

The present invention provides a base station controller communicatingwith a mobile station, which is able to conduct diversity reception, viaa plurality of radio base stations under control of a switching center,the controller comprising enciphering means for enciphering transmittedinformation, which has been received from the switching center andshould be transmitted to the mobile station, so as to generateenciphered transmitted information.

In addition, the present invention provides a base station controllercommunicating with a mobile station, which is able to conduct diversityreception, via a plurality of radio base stations under control of aswitching center, the controller-comprising:retransmission-control-information-adding means for addingretransmission control information to enciphered transmitted informationwhich has been previously enciphered by the switching center; andtransmitting means for transmitting the enciphered transmittedinformation with the retransmission control information to the radiobase stations.

Additionally, the present invention provides a switching centercommunicating with a mobile station, which is able to conduct diversityreception, via a plurality of radio base stations and a base stationcontroller, the switching center comprising enciphering means forenciphering transmitted information, which should be transmitted to themobile station, so as to generate enciphered transmitted information.

In addition, the present invention provides a system for mobilecommunication including a mobile station which is able to conductdiversity reception, a plurality of radio base stations, and a basestation controller communicating via the radio base stations undercontrol of a switching center, the system being characterized in thatthe base station controller enciphers information, which should betransmitted from the side of the switching center to the side of themobile station, before distributing the information to the radio basestations.

Additionally, the present invention provides a system for mobilecommunication including a mobile station which is able to conductdiversity reception, a plurality of radio base stations, and a basestation controller communicating via the radio base stations undercontrol of a switching center, the system being characterized in thatthe switching center enciphers information, which should be transmittedfrom the side of the switching center to the side of the mobile station,before distributing the information to the radio base stations.

In addition, the present invention provides a system for mobilecommunication including a mobile station which is able to conductdiversity reception, a plurality of radio base stations, and a basestation controller communicating via the radio base stations undercontrol of a switching center, the system comprisinglayer-2-enciphering-means for enciphering information that should beprocessed only in one or more layers which are the same as or higherthan layer 2 of the OSI reference model.

Additionally, the present invention provides a system for mobilecommunication including a mobile station which is able to conductdiversity reception, a plurality of radio base stations, and a basestation controller communicating via the radio base stations undercontrol of a switching center, the system comprising:layer-3-enciphering-means for enciphering information that should beprocessed only in one or more layers which are the same as or higherthan layer 3 of the OSI reference model; andlayer-2-mutual-notifying-means for facilitating notification betweenlayers of different devices corresponding to layer 2 of the OSIreference model about an onset of transmission of encipheredinformation.

Furthermore, the present invention provides a system for mobilecommunication including a mobile station which is able to conductdiversity reception, a plurality of radio base stations, and a basestation controller communicating via the radio base stations undercontrol of a switching center, the system comprising:layer-3-enciphering-means for enciphering information that should beprocessed only in one or more layers which are the same as or higherthan layer 3 of the OSI reference model;retransmission-control-information-adding means, at a layercorresponding to layer 2 of the OSI reference model, for addingretransmission control information to information which has beenpreviously enciphered by the layer-3-enciphering means; and transmittingmeans for transmitting the enciphered transmitted information with theretransmission control information to the radio base stations.

In addition, the present invention provides a method for controlling abase station controller communicating with a mobile station, which isable to conduct diversity reception, via a plurality of radio basestations under control of a switching center, the system for mobilecommunication comprising the step of enciphering transmittedinformation, which has been received from the switching center andshould be transmitted to the mobile station, so as to generateenciphered transmitted information.

Furthermore, the present invention provides a method for controlling abase station controller communicating with a mobile station, which isable to conduct diversity reception, via a plurality of radio basestations under control of a switching center, the method comprising thesteps of: adding retransmission control information to encipheredtransmitted information which has been previously enciphered by theswitching center; and transmitting the enciphered transmittedinformation with the retransmission control information to the radiobase stations.

Furthermore, the present invention provides a method for controlling aswitching center communicating with a mobile station, which is able toconduct diversity reception, via a plurality of radio base stations anda base station controller, the method comprising the step of encipheringtransmitted information, which should be transmitted to the mobilestation, so as to generate enciphered transmitted information.

Additionally, the present invention provides a method for controlling asystem for mobile communication including a mobile station which is ableto conduct diversity reception, a plurality of radio base stations, anda base station controller communicating via the radio base stationsunder control of a switching center, the method comprising the step of,at the base station controller, enciphering information, which should betransmitted from the side of the switching center to the side of themobile station, before transmitting the information to the base stationcontroller.

Furthermore, the present invention provides a method for controlling asystem for mobile communication including a mobile station which is ableto conduct diversity reception, a plurality of radio base stations, anda base station controller communicating via the radio base stationsunder control of a switching center, the method comprising the step of,at the switching center, enciphering information, which should betransmitted from the side of the switching center to the side of themobile station, before distributing the information to the radio basestations.

In addition, the present invention provides a method for controlling asystem for mobile communication including a mobile station which is ableto conduct diversity reception, a plurality of radio base stations, anda base station controller communicating via the radio base stationsunder control of a switching center, the method comprising the step ofenciphering information that should be processed only in one or morelayers which are the same as or higher than layer 2 of the OSI referencemodel.

Additionally, the present invention provides a method for controlling asystem for mobile communication including a mobile station which is ableto conduct diversity reception, a plurality of radio base stations, anda base station controller communicating via the radio base stationsunder control of a switching center, the method comprising the steps of:enciphering information that should be processed only in one or morelayers which are the same as or higher than layer 3 of the OSI referencemodel; and facilitating notification between layers of different devicescorresponding to layer 2 of the OSI reference model about an onset oftransmission of enciphered information.

The present invention provides a method for controlling a system formobile communication including a mobile station which is able to conductdiversity reception, a plurality of radio base stations, and a basestation controller communicating via the radio base stations undercontrol of a switching center, the method comprising the steps of:enciphering information that should be processed only in one or morelayers which are the same as or higher than layer 3 of the OSI referencemodel; adding retransmission control information at a layercorresponding to layer 2 of the OSI reference model to information whichhas been previously enciphered by the enciphering step; and transmittingthe enciphered transmitted information with the retransmission controlinformation to the radio base stations.

By virtue of the invention as described above, it is possible for amobile station to conduct diversity reception although the mobilestation cannot simultaneously process enciphered transmission signal andnon-enciphered transmission signal.

In addition, the present invention provides a mobile stationcommunicating with a network over the air, comprisingdecipherment-onset-time-setting-means for setting a time to startdeciphering an enciphered reception signal dependently on a time tostart enciphering a transmission signal in the network and independentlyof a time to start enciphering a transmission signal in the mobilestation.

Furthermore, the present invention provides a mobile station furthercomprising deciphering means for deciphering an enciphered receptionsignal received from the network over the air, thedecipherment-onset-time-setting-means includingencipherment-onset-request-determining means for determining if areception encipherment onset request is received from the network ornot; and decipherment-instructing means for instructing the decipheringmeans to start deciphering in accordance with a time when the receptionencipherment onset request has been received on the basis of thedetermination.

Additionally, the present invention provides a mobile stationcommunicating with a network over the air, comprisingencipherment-onset-time-setting-means for setting a time to startenciphering a transmission signal independently of a time to startdeciphering an enciphered reception signal.

Furthermore, the present invention provides a mobile station furthercomprising transmission-encipherment-onset-requesting means fortransmitting a transmission encipherment onset request to the networkover the air; and enciphering means for enciphering the transmissionsignal so as to generate an enciphered transmission signal, theencipherment-onset-time-setting-means including encipherment-instructingmeans for instructing the enciphering means to start enciphering inaccordance with a time when the transmission encipherment onset requesthas been transmitted.

In addition, the present invention provides a controller in a networkcommunicating with a mobile station over the air, comprisingdecipherment-onset-time-setting-means for setting a time to startdeciphering an enciphered reception signal dependently on a time tostart enciphering a transmission signal in the mobile station andindependently of a time to start enciphering a transmission signal inthe controller.

Furthermore, the present invention provides a controller in a networkfurther comprising deciphering means for deciphering an encipheredreception signal received from the mobile station over the air, thedecipherment-onset-time-setting-means includingencipherment-onset-request-determining means for determining if areception encipherment onset request is received from the network ornot; and decipherment-instructing means for instructing the decipheringmeans to start deciphering in accordance with a time when the receptionencipherment onset request has been received on the basis of thedetermination.

The present invention provides a controller in a network communicatingwith a mobile station over the air, comprisingencipherment-onset-time-setting-means for setting a time to startenciphering a transmission signal independently of a time to startdeciphering an enciphered reception signal.

Furthermore, the present invention provides a controller in a networkfurther comprising transmission-encipherment-onset-requesting means fortransmitting a transmission encipherment onset request to the mobilestation over the air; and enciphering means for enciphering thetransmission signal so as to generate an enciphered transmission signal,the encipherment-onset-time-setting-means includingencipherment-instructing means for instructing the enciphering means tostart enciphering in accordance with a time when the transmissionencipherment onset request has been transmitted.

Additionally, the present invention provides a system for mobilecommunication comprising a mobile station and a network communicatingwith each other over the air,

the network comprising: encipherment-onset-requesting means fortransmitting an encipherment onset request to the mobile station overthe air; first-enciphered-transmission-signal-generating means forenciphering a first transmission signal which should be transmitted fromthe network to the mobile station after the transmission of theencipherment onset request, thereby generating a first encipheredtransmission signal; first-enciphered-transmission-signal-transmittingmeans for transmitting the first enciphered transmission signal to themobile station; response determining means for determining if anencipher onset response by the mobile station indicating that theencipherment onset request is acceptable is received or not; and firstdeciphering means for starting to decipher a second encipheredtransmission signal from the mobile station on the basis of thedetermination of the response determining means when the mobile stationaccepts the encipherment onset request,

the mobile station comprising: request determining means for determiningif the encipherment onset request is received or not;encipherment-onset-responding means for transmitting the enciphermentonset response on the basis of the determination of the requestdetermining means when the encipherment onset request is accepted;second deciphering means for starting to decipher the first encipheredtransmission signal from the network when the encipherment onset requestis accepted; second-enciphered-transmission-signal-generating means forenciphering a second transmission signal which should be transmittedfrom the mobile station to the network after the transmission of theencipherment onset response, thereby generating a second encipheredtransmission signal; andsecond-enciphered-transmission-signal-transmitting means fortransmitting the second enciphered transmission signal to the network.

In addition, the present invention provides a method for controlling amobile station communicating with a network over the air, comprising thestep of setting a time to start deciphering an enciphered receptionsignal dependently on a time to start enciphering a transmission signalin the network and independently of a time to start enciphering atransmission signal in the mobile station.

Furthermore, the present invention provides a method for controlling amobile station, further comprising the step of deciphering an encipheredreception signal received from the network over the air, the step ofsetting a time to start deciphering including the steps of determiningif a reception encipherment onset request is received from the networkor not; and instructing to start the deciphering step in accordance witha time when the reception encipherment onset request has been receivedon the basis of the determination.

Additionally, the present invention provides a method for controlling amobile station communicating with a network over the air, comprising thestep of setting a time to start enciphering a transmission signalindependently of a time to start deciphering an enciphered receptionsignal.

Furthermore, the present invention provides a method for controlling amobile station, further comprising the steps of transmitting atransmission encipherment onset request to the network over the air; andenciphering the transmission signal so as to generate an encipheredtransmission signal, the step of setting a time to start encipheringincluding the step of instructing to start the enciphering step inaccordance with a time when the transmission encipherment onset requesthas been transmitted.

In addition, the present invention provides a method for controlling acontroller in a network communicating with a mobile station over theair, comprising the step of setting a time to start deciphering anenciphered reception signal dependently on a time to start enciphering atransmission signal in the mobile station and independently of a time tostart enciphering a transmission signal in the controller.

Furthermore, the present invention provides a method for controlling acontroller in a network further comprising the step of deciphering anenciphered reception signal received from the mobile station over theair, the step of setting a time to start deciphering including the stepsof determining if a reception encipherment onset request is receivedfrom the network or not; and instructing to start the deciphering stepin accordance with a time when the reception encipherment onset requesthas been received on the basis of the determination.

Additionally, the present invention provides a method for controlling acontroller in a network communicating with a mobile station over theair, comprising the step of setting a time to start enciphering atransmission signal independently of a time to start deciphering anenciphered reception signal.

Furthermore, the present invention provides a method for controlling acontroller in a network further comprising the steps of transmitting atransmission encipherment onset request to the mobile station over theair; and enciphering the transmission signal so as to generate anenciphered transmission signal, the step of setting a time to startenciphering including the step of instructing to start the encipheringstep in accordance with a time when the transmission encipherment onsetrequest has been transmitted.

In addition, the present invention provides a method for controlling asystem for mobile communication in which a mobile station and a networkcommunicate with each other over the air, the method comprising thesteps of: transmitting an encipherment onset request from the network tothe mobile station over the air; enciphering a first transmission signalwhich should be transmitted from the network to the mobile station afterthe transmission of the encipherment onset request, thereby generating afirst enciphered transmission signal; transmitting the first encipheredtransmission signal to the mobile station; determining if an encipheronset response by the mobile station indicating that the enciphermentonset request is acceptable is received or not; starting to decipher asecond enciphered transmission signal from the mobile station on thebasis of the determination of the response determining step when themobile station accepts the encipherment onset request; determining ifthe encipherment onset request is received or not; transmitting theencipherment onset response on the basis of the determination of therequest determining step when the encipherment onset request isaccepted; starting to decipher the first enciphered transmission signalfrom the network when the encipherment onset request is accepted;enciphering a second transmission signal which should be transmittedfrom the mobile station to the network after the transmission of theencipherment onset response, thereby generating a second encipheredtransmission signal; and transmitting the second enciphered transmissionsignal to the network.

By virtue of the aspects of the invention as set forth, although thestructural elements in the network are not provided with the function toread both of enciphered and non-enciphered signals simultaneously assimplifying the system, the timing of the encipherment onset is alignedin the base station and the network, so that the communication betweenthe mobile station and the network can be facilitated surely andsmoothly.

Additionally, the present invention provides a mobile stationcommunicating with a network over the air, comprisingencipherment-procedure-notifying-means for notifying the network aboutencipherment-procedure-specifying-information specifying one or morepossible encipherment procedures of the mobile station.

Furthermore, the present invention provides a mobile station, whereinthe encipherment-procedure-notifying-means further includingenciphering-key-generation-procedure-notifying-means for notifying thenetwork aboutenciphering-key-generation-procedure-specifying-information specifyingone or more possible enciphering key generation procedures of the mobilestation.

In addition, the present invention provides a mobile stationcommunicating with a network over the air, comprising enciphermentcommunication means for conducting an encipherment procedurecorresponding to an encipherment request given by the network and forcommunicating with the network.

Furthermore, the present invention provides a mobile station, whereinthe encipherment communication means includesenciphering-key-generating-means for generating an enciphering keycorresponding to enciphering-key-generation-procedure-specifying-meansspecifying an enciphering key generation procedure notified by thenetwork; and enciphering means for conducting an encipherment procedureusing the enciphering key generated by theenciphering-key-generating-means.

Additionally, the present invention provides a controller in a networkcommunicating with a mobile station over the air, comprisingencipherment-procedure-selecting means for selecting an enciphermentprocedure for communication in accordance withencipherment-procedure-specifying-information, specifying one or morepossible encipherment procedures of the mobile station, notified by themobile station; and encipherment requesting means for notifying themobile station about an encipherment request requesting the mobilestation to conduct an encipherment using the encipherment procedureselected by the encipherment-procedure-selecting means.

Furthermore, the present invention provides a controller in a networkfurther comprising enciphering-key-generation-procedure-selecting-meansfor selecting an enciphering key generation procedure in accordance withenciphering-key-generation-procedure-specifying-information, specifyingone or more possible encipherment procedures of the mobile station,notified by the mobile station; and enciphering-key-notifying means fornotifying the base station about the enciphering key generationprocedure selected by theenciphering-key-generation-procedure-selecting-means.

By virtue of the aspects of the invention as set forth, it is possibleto select the encipherment procedure adapted to the security levelinstructed by the mobile station or the mobile station user, therebyconducting the encipherment procedure. It is also possible select theencipherment procedure adapted to the multimedia service fortransporting voice or moving picture from the mobile station or thenetwork, thereby conducting the encipherment procedure. Furthermore, ifit is necessary to enhance the security level for future extension ofcommunication systems and for newly executed services, it will bepossible to readily introduce a newly developed encipherment procedure.In addition, if a plurality of networks are provided with the abilityfor conducting one or more common encipherment procedures, it ispossible to conduct one of the encipherment procedures when the mobilestation roams across the service areas of the networks although all ofthe possible encipherment procedures are not commonly shared. Even inthis case, it is also possible in each network to conduct one or moreoriginal encipherment procedures.

The present invention provides a method for controlling access linksbetween a mobile station and a network, characterized in that aplurality of branches are established between the network and the mobilestation upon a call attempt to or from the mobile station located at aposition where the mobile station can communicate using diversityhandover, the plurality of branches including a main branch and at leastone auxiliary branch for additional use in order that the mobile stationmay communicate using diversity handover, thereby enabling the mobilestation to commence the diversity handover using the plurality ofbranches.

In addition, the present invention provides a mobile stationcharacterized in that it establishes a plurality of branches between thenetwork and the mobile station upon the reception of a message from thenetwork when no access link is established between the network and themobile station, the message including a request for establishing thebranches, thereby commencing the diversity handover using the pluralityof branches.

Additionally, the present invention provides a base station controllercharacterized in that it establishes a plurality of branches between anetwork and a mobile station upon a call attempt to or from the mobilestation at a location where the mobile station can communicate usingdiversity handover, the plurality of branches including a main branchand at least one auxiliary branch for additional use in order that themobile station may communicate using diversity handover.

In addition, the present invention provides a base station controllercharacterized in that it transmits a message to both of a base stationand a mobile station upon a call attempt to or from the mobile stationat a location where the mobile station can communicate by means ofintra-cell diversity handover wherein the mobile station and the basestation communicate with each other using a plurality of branches, themessage including a request for establishing a plurality of branchesincluding a main branch and at least one auxiliary branch for additionaluse in order that the mobile station may communicate by means ofintra-cell diversity handover.

Additionally, the present invention provides a base station controllercharacterized in that it transmits a message to a plurality of basestations upon a call attempt to or from the mobile station at a locationwhere the mobile station can communicate by means of inter-celldiversity handover wherein the mobile station communicates with theplurality of base stations, the message including a request forestablishing a plurality of branches between the mobile station and thecorresponding base stations.

In addition, the present invention provides a base station characterizedin that it establishes a plurality of branches between the base stationand the mobile station according to an instruction from a base stationcontroller upon a call attempt to or from the mobile station at alocation where the mobile station can communicate by means of intra-celldiversity handover wherein the mobile station and the base stationcommunicate with each other using the plurality of branches, theplurality of branches including a main branch and at least one auxiliarybranch for additional use in order that the mobile station maycommunicate by means of intra-cell diversity handover, thereby enablingthe mobile station to commence the intra-cell diversity handover.

By virtue of the aspects of the invention as set forth, when there isthe mobile station at a location where it can communicate by means ofintra-cell diversity handover wherein the mobile station and the basestation communicate with each other using the plurality of branches, aseries of procedures for establishing the main branch and for adding theauxiliary branch can be carried out upon the call attempt to or from themobile station. Therefore, the number of signal flows can be reduced, sothat it is possible to transit diversity handover condition efficientlyand to decrease the interference to other radio access links.

The present invention provides a method for controlling a branchreplacement characterized in that at least a current branch between anetwork and a mobile station are replaced with a plurality of branchesnecessary for communication using diversity handover when the branchreplacement is necessary for the mobile station and when it isrecognized that the mobile station can commence communicating usingdiversity handover if the branch replacement is carried out, therebyenabling the mobile station to commence diversity handover.

Additionally, the present invention provides a mobile stationcharacterized in that it replaces at least a current branch between anetwork and the mobile station with a plurality of branches necessaryfor communication using diversity handover when a branch replacement isnecessary for the mobile station and when the mobile station cancommence communicating using the diversity handover branches if thebranch replacement is carried out, thereby commencing diversityhandover.

In addition, the present invention provides a base station controllercharacterized in that it replaces at least a current branch between anetwork and a mobile station with a plurality of branches necessary forcommunication using diversity handover when a branch replacement isnecessary for the mobile station and when it is recognized that themobile station can commence communicating using diversity handover ifthe branch replacement is carried out, thereby enabling the mobilestation to commence diversity handover.

Additionally, the present invention provides a base station controllercharacterized in that it transmits a message to a base station and amobile station when a branch replacement is necessary for the mobilestation and when it is recognized that, if the branch replacement iscarried out, the mobile station can commence communicating by means ofintra-cell diversity handover wherein the mobile station and the basestation communicate with each other using a plurality of branches, themessage including an instruction to carry out the branch replacement andan instruction to add at least one auxiliary branch for additional usein order to communicate using diversity handover.

In addition, the present invention provides a base station controllercharacterized in that it transmits an instruction to a plurality of basestations and a message to a mobile station when a branch replacement isnecessary for the mobile station and when it is recognized that themobile station can commence communicating by means of inter-celldiversity handover if the branch replacement is carried out, theinstruction instructing the base stations to set branches necessary forthe diversity handover, the message including an instruction to carryout the branch replacement and an instruction to add at least oneauxiliary branch for additional use in order to communicate usingdiversity handover.

Additionally, the present invention provides a base stationcharacterized in that it replaces a branch for a mobile station and addsat least one auxiliary branch for the mobile station according toinstructions of a message once the base station receives the messagefrom a base station controller, the message including an instruction tocarry out branch replacement and an instruction to add at least oneauxiliary branch for additional use in order to communicate usingdiversity handover, thereby commencing the intra-cell diversityhandover.

The aspects of the invention as set forth replaces the current branch orbranches with the branches adapted to diversity handover upon a triggerfor the branch replacement when it is recognized that the diversityhandover can be commenced if the branch replacement is conducted.Therefore, the number of signal flows can be reduced, so that it ispossible to transit diversity handover condition efficiently and todecrease the interference to other radio access links.

The present invention provides a branch controlling method for a mobilestation capable of treating a plurality of calls simultaneously,characterized in that when a new call occurs while the mobile stationtreats an existent call, at least either of branch structures for bothof the calls or at least either of communication frequency bands forboth of the calls is controlled, so that the branch structures are thesame as each other and the communication frequency bands are the same aseach other.

In addition, the present invention provides a branch controlling methodfor a mobile station capable of treating a plurality of callssimultaneously, characterized in that when a new call occurs while themobile station treats an existent call, a branch structure and acommunication frequency band being the same as those for the existentcall are assigned to the new call.

Additionally, the present invention provides a mobile station capable oftreating a plurality of calls simultaneously, characterized in that whena new call occurs while the mobile station treats an existent call, themobile station uses a branch structure being the same as that for theexistent call to the new call and a communication frequency band beingthe same as that for the existent call to the new call in accordancewith an instruction from a network.

In addition, the present invention provides a base station controlleradapted for a mobile station capable of treating a plurality of callssimultaneously, characterized in that when a new call occurs while themobile station treats an existent call, the base station controllercontrols at least either of branch structures for both of the calls orat least either of communication frequency bands for both of the calls,so that the branch structures are the same as each other and thecommunication frequency bands are the same as each other.

Additionally, the present invention provides a base station controlleradapted for a mobile station capable of treating a plurality of callssimultaneously, characterized in that when a new call occurs while themobile station treats an existent call, the base station controllerassigns a branch structure and a communication frequency band being thesame as that for the existent call to the new call.

By virtue of the aspects of the invention as set forth, it is possibleto assigns the same branch structure and the same frequency band for theplurality of calls including the existent and new calls, so as to easethe control for both of the calls.

The present invention provides a branch controlling method adapted for amobile station capable of treating a plurality of calls simultaneously,characterized in that when a new call occurs while the mobile stationtreats an existent call and when it is impossible to assign a branchstructure or a communication frequency band, being the same as thebranch structure or the communication frequency band for the existentcall, to the new call, another branch structure or another communicationfrequency band which can continue both of the existent and new calls isselected, and the selected branch structure or communication frequencyband is assigned to both of the existent and new calls.

The present invention provides a mobile station capable of treating aplurality of calls simultaneously, characterized in that when a new calloccurs while the mobile station treats an existent call and when it isimpossible to assign a branch structure or a communication frequencyband, being the same as the branch structure or the communicationfrequency band for the existent call, to the new call, the mobilestation assigns another branch structure or another communicationfrequency band, which can continue both of the existent and new calls,to both of the existent and new calls in accordance with an instructionfrom a network.

The present invention provides a base station controller adapted for amobile station capable of treating a plurality of calls simultaneously,characterized in that when a new call occurs while the mobile stationtreats an existent call and when it is impossible to assign a branchstructure or a communication frequency band, being the same as thebranch structure or the communication frequency band for the existentcall, to the new call, the base station controller selects anotherbranch structure or another communication frequency band which cancontinue both of the existent and new calls, and assigns the selectedbranch structure or communication frequency band to both of the existentand new calls.

By virtue of the aspects of the invention as set forth, it is possibleto assigns the same branch structure and the same frequency band for theplurality of calls including the existent and new calls, so as to easethe control for both of the calls.

The present invention provides a branch controlling method adapted for amobile station, characterized in that when a trigger of handover occursto the mobile station which is treating a plurality of calls, a branchstructure or a communication frequency band which can continue all ofthe calls is selected, and the selected branch structure orcommunication frequency band are assigned to all of the calls commonly.

The present invention provides a mobile station capable of treating aplurality of calls simultaneously, characterized in that when a triggerof handover occurs to the mobile station which is treating a pluralityof calls, the mobile station, according to an instruction from anetwork, alters a branch structure or a communication frequency band forall of the calls to a new branch structure or a new communicationfrequency band for all of the calls commonly.

The present invention provides a base station controller adapted for amobile station, characterized in that when a trigger of handover occursto the mobile station which is treating a plurality of calls, the basestation controller selects a branch structure or a communicationfrequency band which can continue all of the calls, and assigns theselected branch structure or communication frequency band to all of thecalls commonly.

By virtue of the aspects of the invention as set forth, it is possibleto assigns the same branch structure and the same frequency band for theplurality of calls during communicating although handover is carriedout, so as to ease the control for all of the calls.

The present invention provides a branch controlling method adapted for amobile station, characterized in that when a trigger of handover occursto the mobile station which is treating a plurality of calls and whenthere is not a branch structure which can continue all of the calls inrelation to the mobile station or when there is not a communicationfrequency band which can continue all of the calls in relation to themobile station, another branch structure or another communicationfrequency band which can continue a plurality of calls being high inpriority among the calls are selected; the other call or calls arereleased; and the selected branch structure and communication frequencyband are assigned to the priority calls.

In addition, the present invention provides a mobile stationcharacterized in that when a trigger of handover occurs to the mobilestation which is treating a plurality of calls and when there is not abranch structure which can continue all of the calls in relation to themobile station or when there is not a communication frequency band whichcan continue all of the calls in relation to the mobile station, themobile station, according to an instruction from a network, releases acall or calls being low in priority; and assigns a branch structure anda communication frequency band selected by the network to a plurality ofcalls being high in priority.

Additionally, the present invention provides a base station controlleradapted for a mobile station, characterized in that when a trigger ofhandover occurs to the mobile station which is treating a plurality ofcalls and when there is not a branch structure which can continue all ofthe calls in relation to the mobile station or there is not acommunication frequency band which can continue all of the calls inrelation to the mobile station, the base station controller selectsanother branch structure and another communication frequency band whichcan continue a plurality of calls being high in priority among thecalls; releases the other call or calls; and assigns the selected branchstructure and communication frequency band to the priority calls.

By virtue of the aspects of the invention as set forth, it is possibleto continue the calls with a high priority when the trigger for handoveroccurs although there are not a branch structure and a communicationfrequency band which can continue all of the calls. In other words, itis possible to continue at least the calls with a high priority althoughthere are not ample wireless communication resources.

In addition, the present invention provides a method for establishing acontrol channel in a mobile communication system wherein a mobilestation treats a plurality of calls using a plurality of sets ofwireless communication resources, characterized in that a single controlchannel is established between the mobile station and a network fortransporting control information therebetween in a manner that thecontrol channel is formed by one of the sets of wireless communicationresources which are being used for a plurality of calls by the mobilestation.

By virtue of the invention, it is possible to reduce the number ofhardware elements for transporting control information in comparisonwith the case that all of the plurality of calls utilize controlchannels, respectively. In addition, it is possible to excludecomplicated control procedures, e.g., management of the transportationorder of control information in the plurality of control channels.

Additionally, the present invention provides a method for controlling toreplace a control channel, characterized in that while a mobile stationtreats a plurality of calls using a plurality of sets of wirelesscommunication resources and transmits or receives control information toor from a network via a single control channel formed by one of the setsof the wireless communication resources, and when a first call using thecontrol channel formed by one of the sets of the wireless communicationresources should be released and a second call should be continued, thecontrol channel, which is formed by one of the sets of the wirelesscommunication resources and should be released, is replaced with a newcontrol channel formed by another set of the wireless communicationresources, thereby continuing to control the second call.

In addition, the present invention provides a base station controller,characterized in that while a mobile station treats a plurality of callsusing a plurality of sets of wireless communication resources andtransmits or receives control information to or from a network via acontrol channel formed by one of the sets of the wireless communicationresources, and when a first call using the control channel formed by oneof the sets of the wireless communication resources should be releasedand a second call should be continued, the controller replaces thecontrol channel, which is formed by one of the sets of the wirelesscommunication resources and should be released, to a new control channelformed by another set of the wireless communication resources, therebycontinuing to control the second call.

By virtue of the aspects of the invention as set forth, while a mobilestation transmits or receives control information with respect to aplurality of calls via a common control channel, and when a first callusing the control channel formed by one of the sets of the wirelesscommunication resources should be released and a second call should becontinued by means of another set of the wireless communicationresources, the control channel is replaced. Accordingly, after thereplacement, by means of the new control channel, it is possible tocontinue the transportation of control signal for the second call.

The present invention provides a method for determining a radio zone andan uplink transmission power, characterized in that

each of base stations transmits broadcast information indicating a perchchannel transmission power level and an uplink interference level via acorresponding perch channel; and

a mobile station receives the broadcast information from near basestations around the mobile station;

detects respective reception levels of the perch channels for the nearbase stations;

calculates respective path losses between the mobile station andrespective near base stations on the basis of the respective receptionlevels and the respective perch channel transmission power levels withinthe broadcast information;

calculates respective necessary uplink transmission power levels betweenthe mobile station and respective near base stations on the basis of thecalculated respective path losses, the respective uplink interferencelevels within the broadcast information, and requiredsignal-to-interference ratios involved in reception by the near basestations;

selects a radio zone in which the necessary uplink transmission powerlevel is minimum among the respective necessary uplink transmissionpower levels, the base station of the selected radio zone being readyfor communication with the mobile station or being able to commencecommunication with the mobile station after handover; and

controls an uplink transmission power in the selected radio zone basedon the necessary uplink transmission power level of the selected radiozone.

Additionally, the present invention provides a base station comprisingmeans for transmitting broadcast information indicating a perch channeltransmission power level and an uplink interference level via a perchchannel.

In addition, the present invention provides a mobile stationcharacterized in that it

receives broadcast information from near base stations around the mobilestation via respective perch channels, the broadcast information fromeach of the near base stations indicating a perch channel transmissionpower level and an uplink interference level;

detects respective reception levels of the perch channels for the nearbase stations;

calculates respective path losses between the mobile station andrespective near base stations on the basis of the respective receptionlevels and the respective perch channel transmission power levels withinthe broadcast information;

calculates respective necessary uplink transmission power levels betweenthe mobile station and respective near base stations on the basis of thecalculated respective path losses, the respective uplink interferencelevels within the broadcast information, and requiredsignal-to-interference ratios involved in reception by the near basestations;

selects a radio zone of which the necessary uplink transmission powerlevel is minimum among the respective necessary uplink transmissionpower levels, the base station of the selected radio zone being readyfor communication with the mobile station or being able to commencecommunication with the mobile station after handover; and

controls an uplink transmission power in the selected radio zone basedon the necessary uplink transmission power level of the selected radiozone.

By virtue of the aspects of the invention as set forth, although perchchannel transmission power levels for respective base stations aredifferent from each other or one another, it is possible to optimize theuplink transmission power of the mobile station.

The present invention provides a handover controlling method foradditionally establishing a handover branch between a mobile station anda network, characterized in that a procedure for additionalestablishment of a branch is completed with a state transition to whichthe mobile station can commence communicating without waiting for aconfirmation of synchronization for all branches.

The present invention provides a handover controlling method furthercharacterized in that the procedure for additional branch establishmentis completed with confirmation of synchronization for one branch amongthe branches established for the mobile station.

Additionally, the present invention provides a mobile stationcharacterized in that if the mobile station has received a request froma network to establish a new additional branch between the network andthe mobile station, the mobile station establishes the new branch andthen starts diversity reception upon reception of a signal through thenew branch.

In addition, the present invention provides a base station characterizedin that if the base station has received a request from a base stationcontroller to establish a new additional branch between a mobile stationand the base station for carrying out intra-cell diversity handover, thebase station additionally establishes the new branch and then startsintra-cell diversity reception upon reception of a signal through thenew branch.

Additionally, the present invention provides a base stationcharacterized in that if the base station has received a request from abase station controller to establish a new additional branch between amobile station and the base station for carrying out inter-celldiversity handover, the base station establishes the new branch and thenstarts sending the received signals to the base station controller thatexecutes inter-cell diversity reception upon reception of a signalthrough the new branch.

In addition, the present invention provides a base station controllercharacterized in that when the base station controller establishes a newadditional branch between a mobile station and a network, the basestation controller provides a request for establishing the new branchand then completes a procedure for additional establishment of the newbranch without waiting for a confirmation of synchronization for allbranches between the mobile station and the network.

Furthermore, the present invention provides a base station controllerfurther characterized in that it provides the request for establishingthe new branch being necessary for inter-cell diversity handover, andthen starts inter-cell diversity reception upon reception of signalsthrough the branches being necessary for inter-cell diversity handover.

By virtue of the aspects of the invention as set forth, since theprocedure for additional establishment of the new branch is completedwhen the mobile station can communicate, the additional establishmentprocedure can be ended in a short time period.

The present invention provides a radio mobile communication systemwherein a plurality of channels can be established on a single carrierfrequency by code division multiplex access, characterized in that thesystem comprises code-resource-assigning means for assigning at least apart of an assignable code resource to one of the channels in accordancewith a transmission rate necessary for the corresponding channel, thepart corresponding to a certain bandwidth corresponding to thetransmission rate.

Furthermore, the present invention provides a radio mobile communicationsystem further comprising channel-assigning means for assigning one ofthe channels, to which a part of the assignable code resource isassigned, to a mobile station in accordance with a transmission ratenecessary for the mobile station.

Additionally, the present invention provides a radio mobilecommunication system wherein a plurality of channels can be establishedon a single carrier frequency by code division multiplex access,characterized in that the system comprises a plurality of assignablecode resources, each of code resources corresponding to a certainbandwidth and being independent of the other code resources; andreassigning means for reassigning a part of an assignable code resourceto one of the channels to which a part of another assignable coderesource is already assigned if there is not an unused code resourcecorresponding to a bandwidth suitable for a necessary transmission ratewhen assigning an unused assignable code resource to one of the channelsin accordance with the necessary transmission rate.

Additionally, the present invention provides a radio mobilecommunication system further comprising unused-code-resource determiningmeans for determining if there is an unused code resource correspondingto a bandwidth suitable for a necessary transmission rate or not whenassigning an unused assignable code resource to one of the channels inaccordance with the necessary transmission rate necessary.

Furthermore, the present invention provides a radio mobile communicationsystem according to claim 91, wherein at least one standard coderesource corresponding to a predetermined bandwidth is preselected andthe system comprises assignment-possibility-determining means fordetermining at predetermined moments if there is at least one unusedstandard code resource or not, the reassigning means reassigning a partof an assignable code resource to one of the channels to which a part ofanother assignable code resource is already assigned until an unusedstandard code resource is reserved if the determination result by theassignment-possibility-determining means has been negative.

In addition, the present invention provides a radio base station forwhich a plurality of channels can be established on a single carrierfrequency by code division multiplex access, characterized in that itcomprises code-resource-assignment-possibility-determining means fordetermining whether or not it is possible to assign at least a part ofan assignable code resource to one of channels in accordance with atransmission rate necessary for the corresponding channel, the partcorresponding to a certain bandwidth corresponding to the transmissionrate.

The present invention provides a base station controller furthercomprising channel-assigning means for assigning a channel, to which apart of assignable code resource is assigned, to a mobile station inaccordance with a transmission rate necessary for the mobile station.

Additionally, the present invention provides a method for controlling aradio mobile communication system wherein a plurality of channels can beestablished on a single carrier frequency by code division multiplexaccess, characterized in that the method comprisescode-resource-assigning step for assigning at least a part of anassignable code resource to one of the channels in accordance with atransmission rate necessary for the corresponding channel, the partcorresponding to a certain bandwidth corresponding to the transmissionrate.

In addition, the present invention provides a method for controlling aradio mobile communication system including a plurality of assignablecode resources, each of code resources corresponding to a certainbandwidth and being independent of the other code resources, a pluralityof channels being capable of being established on a single carrierfrequency by code division multiplex access, characterized in that inorder to assign an unused assignable code resource to one of thechannels in accordance with a necessary transmission rate, the methodcomprises the steps of determining whether or not there is an unusedcode resource having a code resource length in accordance with thenecessary transmission rate; and reassigning a part of an assignablecode resource to one of the channels to which a part of anotherassignable code resource is already assigned if the determinationindicates that there is not an unused code resource having a bandwidthsuitable for the necessary transmission rate.

Additionally, the present invention provides a method for controllingradio base station for which a plurality of channels can be establishedon a single carrier frequency by code division multiplex access,characterized in that it comprises acode-resource-assignment-possibility-determining step for determiningwhether or not it is possible to assign at least a part of an assignablecode resource to one of channels in accordance with a transmission ratenecessary for the corresponding channel, the part corresponding to acertain bandwidth corresponding to the transmission rate.

In addition, the present invention provides a method for controlling aradio base station comprising a channel-assigning step for assigning achannel, to which a part of an assignable code resource is assigned to amobile station in accordance with a transmission rate necessary for themobile station.

By virtue of the aspects of the invention as set forth, it is possibleto minimize the number of reassignments or rearrangements of coderesources for channels, and call generations do not involve therearrangement of code resource. Therefore, it is possible to reduceconnection time delay.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a block diagram showing the entire structure of a mobilecommunications system in accordance with W-CDMA of one embodiment of thepresent invention.

FIG. 2 is a block diagram showing a part of the system, particularlyshowing access interfaces in the system.

FIG. 3 is a diagram showing the functional network architecture of thesystem, in which functional entities are arranged in a communicationcontrol plane and a radio resource control plane.

FIG. 4 is a diagram showing the functional network architecture of thesystem, in which functional entities are arranged in a communicationcontrol plane and a radio resource control plane.

FIG. 5 is a diagram showing the functional model of a part of theinvented system for describing an origination for initial call.

FIG. 6 is a diagram showing the functional model of a part of theinvented system for describing an origination for additional call.

FIGS. 7 and 8 form an information flow diagram showing the originationfor initial call.

FIG. 9 is an information flow diagram showing the origination foradditional call.

FIG. 10 is a diagram showing the functional model of a part of theinvented system for describing acceptance of initial incoming call.

FIG. 11 is a diagram showing the functional model of a part of theinvented system for describing acceptance of additional incoming call.

FIGS. 12 through 14 form an information flow diagram showing theacceptance of initial incoming call.

FIGS. 15 and 16 form an information flow diagram showing the acceptanceof additional incoming call.

FIG. 17 is a diagram showing the functional model of a part of theinvented system for describing a disconnection instructed by a user.

FIG. 18 is an information flow diagram showing the disconnectioninstructed by a user.

FIG. 19 is a diagram showing the functional model of a part of theinvented system for describing a disconnection instructed by thenetwork.

FIG. 20 is an information flow diagram showing the disconnectioninstructed by the network.

FIG. 21 is a diagram showing the functional model of a part of theinvented system for describing an abnormal release caused from a radiolink failure detected by a mobile terminal.

FIG. 22 is an information flow diagram of the abnormal release causedfrom the radio link failure detected by the mobile terminal.

FIG. 23 is a diagram showing the functional model of a part of theinvented system for describing an abnormal release caused from a radiolink failure detected by the network.

FIG. 24 is an information flow diagram of the abnormal release causedfrom the radio link failure detected by the network.

FIG. 25 is a diagram showing the functional model of a part of theinvented system for describing a user disconnect.

FIG. 26 is an information flow diagram of the user disconnect.

FIG. 27 is a diagram showing the functional model of a part of theinvented system for describing an SDCCH setup process.

FIG. 28 is an information flow diagram of the SDCCH setup process.

FIG. 29 is a diagram showing the functional model of a part of theinvented system for describing a bearer setup for the radio resourceselection.

FIG. 30 is an information flow diagram of the bearer setup, executed inthe communication control plane, for the radio resource selection.

FIG. 31 is a diagram showing the functional model of a part of theinvented system for describing a radio bearer release.

FIG. 32 is an information flow diagram of the radio bearer release.

FIG. 33 is a diagram showing the functional model of a part of theinvented system for describing an SDCCH release.

FIG. 34 is an information flow diagram of the SDCCH release.

FIG. 35 is a flow chart showing handover processes in general.

FIG. 36 is an information flow diagram showing processes 1 and 2described above.

FIG. 37 is an information flow diagram representing a sequence in whichinformation flows are transported for starting non-soft handoverexecution, the sequence corresponding to process 1 in FIG. 35.

FIG. 38 is an information flow diagram representing a sequence in whichinformation flows are transported for starting handover branch addition,the sequence corresponding to process 1 in FIG. 35.

FIG. 39 is an information flow diagram representing a sequence in whichinformation flows are transported for starting handover branch deletion,the sequence corresponding to process 1 in FIG. 35.

FIG. 40 is a diagram showing the functional model of a part of theinvented system for describing an inter-sector handover branch additionin a single cell.

FIG. 41 is an information flow diagram of the inter-sector handoverbranch addition in a single cell, executed in the communication controlplane.

FIG. 42 is a diagram showing the functional model of a part of theinvented system for describing an inter-cell handover branch addition.

FIG. 43 is an information flow diagram of the inter-cell handover branchaddition, executed in the communication control plane.

FIG. 44 is a diagram showing the functional model of a part of theinvented system for describing an inter-sector handover branch deletionin a single cell.

FIG. 45 is an information flow diagram of the inter-sector handoverbranch deletion in a single cell, executed in the communication controlplane.

FIG. 46 is a diagram showing the functional model of a part of theinvented system for describing an inter-cell handover branch deletion.

FIG. 47 is an information flow diagram of the inter-cell handover branchdeletion, executed in the communication control plane.

FIG. 48 is a diagram showing the functional model of a part of theinvented system for describing an intra-cell branch replacementhandover.

FIG. 49 is an information flow diagram of the intra-cell branchreplacement handover executed in the communication control plane.

FIG. 50 is a diagram showing the functional model of a part of theinvented system for describing an inter-cell branch replacementhandover.

FIG. 51 is an information flow diagram of the inter-cell branchreplacement handover executed in the communication control plane.

FIG. 52 is a diagram showing the functional model of a part of theinvented system for describing an ACCH replacement procedure.

FIGS. 53 and 54 cooperate to form an information flow diagram of theACCH replacement procedure executed in the communication control plane.

FIG. 55 is a diagram showing the functional model of a part of theinvented system for describing a code replacement.

FIG. 56 is an information flow diagram of the code replacement procedureexecuted in the communication control plane.

FIG. 57 is a diagram showing the functional model of a part of theinvented system for describing a transmission power control.

FIG. 58 is an information flow diagram of the transmission power controlexecuted in the communication control plane.

FIG. 59 is a diagram showing the functional model of a part of theinvented system for describing a terminal location updating.

FIGS. 60 and 61 form an information flow diagram of the terminallocation updating.

FIG. 62 is a diagram showing the functional model of a part of theinvented system for describing a user authentication.

FIG. 63 is an information flow diagram representing the userauthentication procedure in the invented system.

FIG. 64 is a diagram showing functional entities in the invented systemfor describing an encipherment onset time notification.

FIG. 65 is an information flow diagram representing the enciphermentonset time notification.

FIG. 66 is a diagram showing functional entities in the invented systemfor describing a TMUI assignment.

FIG. 67 is an information flow diagram representing the TMUI assignment.

FIG. 68 is an information flow diagram representing a user ID retrieval.

FIG. 69 is a diagram representing the correlation between physical nodeconfiguration and functional entities in the invented system.

FIG. 70 is a diagram representing the signaling layer 2 protocolarchitecture over the radio interface.

FIG. 71 is a diagram representing a sample frame structure for the BSCfunction termination.

FIG. 72 is a diagram representing the format of a sequenced data PDU (SDPDU).

FIG. 73 is a diagram representing the format of asequenced-data-with-status-request PDU (SD-with-POLL PDU).

FIG. 74 is a diagram representing the format of a POLL PDU.

FIG. 75 is a diagram representing the format of a STAT PDU.

FIG. 76 is a diagram representing the format of a USTAT PDU.

FIG. 77 is a diagram representing the format of a UD PDU and a MD PDU.

FIG. 78 is a diagram representing the format of a Begin PDU (BGN PDU).

FIG. 79 is a diagram representing the format of a BGAK PDU.

FIG. 80 is a diagram representing the format of a BGREJ PDU.

FIG. 81 is a diagram representing the format of an END PDU.

FIG. 82 is a diagram representing the format of an ENDAK PDU.

FIG. 83 is a diagram representing the format of an RS PDU.

FIG. 84 is a diagram representing the format of an RSAK PDU.

FIG. 85 is a diagram representing the format of an ER PDU.

FIG. 86 is a diagram representing the format of an ERAK PDU.

FIG. 87 is a diagram representing the frame format of an MDU and theframe format on the broadcasting channel (BCCH).

FIG. 88 is a diagram representing the frame format of an MDU and theframe format on the perch channel (PCH).

FIG. 89 is a diagram representing the frame format of an MDU and theformat of long and short frame on the random access channel (RACH).

FIG. 90 is a diagram representing the frame format of an MDU and theformat of long frame on the forward access channel (FACH).

FIG. 91 is a diagram representing the frame format of an MDU and theformat of short frame on the forward access channel (FACH).

FIG. 92 is a diagram representing the frame format of an MDU and theframe format on the stand alone dedicated control channel (SDCCH)

FIG. 93 is a diagram representing the frame format of an MDU and theframe format on the associated control channel (ACCH).

FIG. 94 is a diagram representing the frame format of an MDU and theframe format on the user packet channel (UPCH)

FIG. 95 is a conceptual diagram representing an example of the radiointerface protocol architecture of layer 3 of the invented system.

FIG. 96 represents the basic format of RBC entity message of theinvented system.

FIG. 97 represents structures of frames of an RBC entity message.

FIG. 98 is a diagram representing a common structure of CC(call/connection control) entity protocol messages.

FIG. 99 is a diagram representing a protocol discriminator of the CCentity protocol messages.

FIG. 100 is a diagram representing a call reference of the CC entityprotocol messages.

FIG. 101 is a diagram representing a dummy call reference of the CCentity protocol messages.

FIG. 102 is a diagram representing the format of a message typeidentifier of each CC entity message.

FIGS. 103 and 104 are diagrams respectively representing the formats ofvariable length information elements according to FPLMTS.

FIG. 105 is a diagram representing the coding format of a broadbandlocking shift information element.

FIG. 106 is a diagram representing the coding format of a broadbandnon-locking shift information element.

FIGS. 107 through 111 form a diagram representing the coding format ofan AAL parameter information element.

FIG. 112 is a diagram representing the format of an ATM trafficdescriptor information element.

FIG. 113 is a diagram representing the format of a broadband bearercapability information element.

FIG. 114 is a diagram representing the format of a broadband high layerinformation element.

FIGS. 115 and 116 form a diagram representing the format of a broadbandlow layer information element.

FIG. 117 is a diagram representing the format of a called party numberinformation element.

FIG. 118 is a diagram representing the format of a called partysub-address information element.

FIG. 119 is a diagram representing the format of a calling party numberinformation element.

FIG. 120 is a diagram representing the format of a calling partysub-address information element.

FIG. 121 is a diagram representing the format of a connection identifierinformation element.

FIG. 122 is a diagram representing the format of an end-to-end transitdelay information element.

FIG. 123 is a diagram representing the format of a QOS (quality ofservice) parameter information element.

FIG. 124 is a diagram representing the format of a broadband repeatindicator information element.

FIG. 125 is a diagram representing the format of a broadband sendingcomplete information element.

FIG. 126 is a diagram representing the format of a transit networkselection information element.

FIG. 127 is a diagram representing the format of a notificationindicator information element.

FIG. 128 is a diagram representing the format of an OAM trafficdescriptor information element.

FIG. 129 is a diagram representing the format of a narrow-band bearercapability information element.

FIG. 130 is a diagram representing the format of a narrow-band highlayer compatibility information element.

FIG. 131 is a diagram representing the format of a narrow-band low layercompatibility information element.

FIG. 132 is a diagram representing the format of a progress indicatorinformation element.

FIG. 133 is a diagram representing the format of a TMUI informationelement.

FIG. 134 is a diagram representing the format of a TMUI assignmentsource ID.

FIG. 135 is a diagram representing the format of an IMUI.

FIG. 136 is a diagram representing the format of an executionauthentication type.

FIG. 137 is a diagram representing the format of an authenticationrandom pattern.

FIG. 138 is a diagram representing the format of an authenticationciphering pattern.

FIG. 139 is a diagram representing the format of an execution cipheringtype.

FIG. 140 is a diagram representing the format of a TC information.

FIG. 141 is a diagram representing the format of a message typeidentifier of the RBC entity message.

FIG. 142 is a diagram representing the format of an information elementidentifier.

FIG. 143 is a diagram representing the format of a radio bearer setupmessage specific parameter.

FIG. 144 is a diagram representing the format of a radio bearer releasemessage specific parameter.

FIG. 145 is a diagram representing the format of a radio bearer releasecomplete message specific parameter.

FIG. 146 is a diagram representing the format of a handover commandmessage specific parameter.

FIG. 147 is a diagram representing the format of a handover responsemessage specific parameter.

FIGS. 148 to 151 form a diagram representing the format of a radiobearer setup information.

FIGS. 152 through 154 form a diagram representing the format of a DHO(diversity handover) branch addition information element.

FIG. 155 is a diagram representing the format of a DHO (diversityhandover) branch deletion information element.

FIG. 156 is a diagram representing the format of an ACCH replacementinformation element.

FIGS. 157 through 159 form a diagram representing the format of a branchreplacement information element.

FIGS. 160 through 163 form a diagram representing the format of a userrate replacement information element.

FIGS. 164 and 165 form a diagram representing the format of a codereplacement information element.

FIG. 166 is a diagram representing the format of a message typeidentifier in RRC entity messages.

FIG. 167 is a diagram representing the format of a facility informationelement.

FIGS. 168 and 169 form a diagram representing the format of an ROSE PDU.

FIG. 170 is a diagram representing the common format of parameters ofnumber of visited candidate sectors, number of in-use visited sectors,number of candidate sectors to be added at DHO, number of sectors to bedeleted at DHO, and candidate sectors for HHO.

FIG. 171 is a diagram representing the format of a BTS number parameter.

FIG. 172 is a diagram representing the format of a sector numberparameter.

FIG. 173 is a diagram representing the format of a perch channelreception SIR parameter.

FIG. 174 is a diagram representing the format of a perch channeltransmission power parameter.

FIG. 175 is a diagram representing the format of a long code phasedifference parameter.

FIG. 176 is a diagram representing the format of a parameter of thenumber of RBC IDs.

FIG. 177 is a diagram representing the format of a parameter of the RBCID.

FIG. 178 is a diagram representing the format of a parameter of thenecessary SIR.

FIG. 179 is a diagram representing the format of a parameter of FERmeasurement.

FIG. 180 is a diagram representing the format of a TAC entity message.

FIG. 181 is a diagram representing the format of a protocoldiscriminator.

FIG. 182 is a diagram representing the format of a message typeidentifier.

FIG. 183 is a diagram representing the format of a terminal associationsetup message specific parameter.

FIG. 184 is a diagram representing the format of a paging responsemessage specific parameter.

FIG. 185 is a diagram representing the format of a terminal associationrelease message specific parameter.

FIG. 186 is a diagram representing the format of a cause informationelement.

FIG. 187 is a diagram representing the format of a mobile station typeinformation element.

FIG. 188 is a diagram representing the format of a paged MS IDinformation element.

FIG. 189 is a diagram representing the format of a paging ID informationelement.

FIG. 190 is a diagram representing the format of a TMUI informationelement.

FIG. 191 is a diagram representing the format of an extensionalinformation element for TAC entity messages.

FIG. 192 is a diagram representing the format of a message typeinformation element.

FIG. 193 is a diagram representing the format of a length informationelement.

FIG. 194 is a diagram representing the format of a perch channelreception SIR information element.

FIG. 195 is a diagram representing the format of a short code numberinformation element.

FIG. 196 is a diagram representing the format of a frame offset groupinformation element.

FIG. 197 is a diagram representing the format of a slot offset groupinformation element.

FIG. 198 is a diagram representing the format of a network number groupinformation element.

FIG. 199 is a diagram representing the format of a network versioninformation element.

FIG. 200 is a diagram representing the format of a mobile station commonparameter version information element.

FIG. 201 is a diagram representing the format of a BTS numberinformation element.

FIG. 202 is a diagram representing the format of a sector numberinformation element.

FIG. 203 is a diagram representing the format of an information elementindicating the number (N) of registration areas overlapped in one radiozone.

FIG. 204 is a diagram representing the format of an area numberinformation element.

FIG. 205 is a diagram representing the format of an information elementindicating the calibrated power level necessary for reception at thebase station.

FIG. 206 is a diagram representing the format of an information elementindicating the calibrated power level necessary for reception at thebase station.

FIG. 207 is a diagram representing the format of an information elementindicating the number (M) of perch channel LC for determination ofvisited zone.

FIG. 208 is a diagram representing the format of an information elementindicating the number (K) of frequency bands used by base station.

FIG. 209 is a diagram representing the format of a frequency bandinformation element.

FIG. 210 is a diagram representing the format of a BCCH receptionduration information element.

FIG. 211 is a diagram representing the format of an information elementindicating the number of paged mobile stations.

FIG. 212 is a diagram representing the format of a paged MS IDinformation element.

FIG. 213 is a diagram representing the format of a paging ID informationelement.

FIG. 214 is a conceptual diagram representing the protocol architectureon a BTS-MCC interface.

FIG. 215 is a diagram representing the format of a BC entity message.

FIG. 216 is a diagram representing the format of a BSM entity message.

FIG. 217 is a diagram representing the format of the pattern offundamental information elements in the BSM entity message.

FIG. 218 is a diagram representing the format of the pattern of eachfundamental information element in the BC entity message.

FIG. 219 is a diagram representing the format of a protocoldiscriminator of a BC entity message.

FIG. 220 is a diagram representing the format of a message typeidentifier of a BC entity message.

FIG. 221 is a diagram representing the format of a parameter of linkreference of a BC entity message.

FIG. 222 is a diagram representing the format of an information elementidentifier of a BC entity message.

FIG. 223 is a diagram representing the format of a length of informationelement of a BC entity message.

FIG. 224 is a diagram representing the format of an AAL type parameterof a BC entity message.

FIG. 225 is a diagram representing the format of a link identifier of aBC entity message.

FIG. 226 is a diagram representing the format of a transmission qualityparameter of a BC entity message.

FIG. 227 is a diagram representing the format of a sector number of a BCentity message.

FIG. 228 is a diagram representing the format of a bearer capabilityparameter of a BC entity message.

FIG. 229 is a diagram representing the format of a frequency selectioninformation of a BC entity message.

FIG. 230 is a diagram representing the format of a frequency of a BCentity message.

FIG. 231 is a diagram representing the format of a frame offset groupparameter of a BC entity message.

FIG. 232 is a diagram representing the format of a slot offset group ofa BC entity message.

FIG. 233 is a diagram representing the format of a long code phasedifference parameter of a BC entity message.

FIG. 234 is a diagram representing the format of a reverse long codenumber of a BC entity message.

FIG. 235 is a diagram representing the format of a reverse short codetype parameter of a BC entity message.

FIG. 236 is a diagram representing the format of a parameter of thenumber of reverse short codes of a BC entity message.

FIG. 237 is a diagram representing the format of a reverse short codenumber of a BC entity message.

FIG. 238 is a diagram representing the format of a forward short codetype parameter of a BC entity message.

FIG. 239 is a diagram representing the format of a parameter of numberof forward short codes of a BC entity message.

FIG. 240 is a diagram representing the format of an AAL type parameterfor ACCH of a BC entity message.

FIG. 241 is a diagram representing the format of a link identifier forACCH of a BC entity message.

FIG. 242 is a diagram representing the format of a transmission qualityfor ACCH of a BC entity message.

FIG. 243 is a diagram representing the format of a forward short codenumber of a BC entity message.

FIG. 244 is a diagram representing the format of a result parameter of aBC entity message.

FIG. 245 is a diagram representing the format of a cause parameter of aBC entity message.

FIG. 246 is a diagram representing the format of an initial transmissionpower parameter of a BC entity message.

FIG. 247 is a diagram representing the format of a location identityparameter of a BC entity message.

FIG. 248 is a diagram representing the format of a protocoldiscriminator of a BSM entity message.

FIG. 249 is a diagram representing the format of a message typeidentifier of a BSM entity message.

FIG. 250 is a diagram representing the format of a PCHs calculationinformation of a BSM entity message.

FIG. 251 is a diagram representing the format of an area number of a BSMentity message.

FIG. 252 is a diagram representing the format of a paged MS ID of a BSMentity message.

FIG. 253 is a diagram representing the format of a paging ID of a BSMentity message.

FIG. 254 represents an SDL diagram for base station management.

FIG. 255 represents an SDL diagram for bearer control in the SDCCHexecuted in the BSC function of the network.

FIG. 256 represents an SDL diagram for bearer control in the TCH/ACCHexecuted in the BSC function of the network.

FIG. 257 represents an SDL diagram for bearer control in the SDCCHexecuted in the BTS.

FIG. 258 represents an SDL diagram for bearer control in the TCH/ACCHexecuted in the BTS.

FIG. 259 is a diagram showing radio zones and a travelling mobilestation in the invented system for describing an exemplified handoverprocess.

FIG. 260 is a block diagram showing an example of mobile communicationssystem wherein a mobile station communicates through a plurality ofcalls.

FIG. 261 is a block diagram showing the invented mobile communicationssystem wherein a mobile station communicates through a plurality ofcalls and capable of replacing an associated control channel.

FIG. 262 is a sequential diagram representing the ACCH replacementprocedure carried out by the invented system.

FIG. 263 is a diagram showing the OSI reference model.

FIG. 264 is a diagram representing a sequential operation by the networkand a mobile station MS in the invented system, which starts after acall attempt comes in the network.

FIG. 265 is a table indicating the glossary of the abbreviations used inthe present specification.

FIG. 266 is a table representing the features of services provided bythe invented system.

FIG. 267 is a table representing the features of the voice bearerservice at 8 kbps provided by the invented system.

FIG. 268 is a table representing the features of the unrestricted bearerservice at 64 kbps provided by the invented system.

FIG. 269 is a table representing the features of the multiple-rateunrestricted bearer service provided by the invented system.

FIG. 270 is a table representing the correlation between FE numbers andfunctional entities in the system.

FIG. 271 is a table representing the correlation between therelationship designations and the related functional entities.

FIG. 272 is a table representing the detail of a TA SETUP requestindication.

FIG. 273 is a table representing the detail of another TA SETUP requestindication.

FIG. 274 is a table representing the detail of a TA SETUP PERMISSIONrequest indication.

FIG. 275 is a table representing the detail of a REVERSE LONG CODERETRIEVAL request indication used to retrieve the reverse long code.

FIG. 276 is a table representing the detail of another REVERSE LONG CODERETRIEVAL request indication used to retrieve the reverse long code.

FIG. 277 is a table representing the detail of a REVERSE LONG CODERETRIEVAL response confirmation used to retrieve the reverse long code.

FIG. 278 is a table representing the detail of a TERMINAL STATUS UPDATErequest indication used to update the terminal status.

FIG. 279 is a table representing the detail of a TERMINAL STATUS UPDATEresponse confirmation.

FIG. 280 is a table representing the detail of an ADD-ROUTINGINFORMATION request indication sent to an LRDF to add the routingaddress to the subscriber's profile.

FIG. 281 is a table representing the detail of an ADD-ROUTINGINFORMATION response confirmation.

FIG. 282 is a table representing the detail of a TA SETUP PERMISSIONresponse confirmation issued by the LRCF to inform the TACF that themobile terminal access to the network is authorized.

FIG. 283 is a table representing the detail of a REVERSE LONG CODERETRIEVAL response confirmation used to retrieve the reverse long code.

FIG. 284 is a table representing the detail of a TA SETUP responseconfirmation used to notify that the terminal access has beenestablished.

FIG. 285 is a table representing the detail of another TA SETUP responseconfirmation used to confirm that the setup of terminal access and theconnection between a CCAF and TACAF have been completed.

FIG. 286 is a table representing the detail of a SETUP requestindication used to request the establishment of a connection.

FIG. 287 is a table representing the detail of a TACF INSTANCE IDINDICATION request indication used to retrieve the reverse long code.

FIG. 288 is a table representing the detail of a CELL CONDITIONMEASUREMENT request indication.

FIG. 289 is a table representing the detail of a CELL CONDITIONMEASUREMENT response confirmation that provides the result of the cellselection information measurement requested by the CELL CONDITIONMEASUREMENT request indication.

FIG. 290 is a table representing the detail of a CELL CONDITION REPORTrequest indication.

FIG. 291 is a table representing the detail of a CALL SETUP PERMISSIONrequest indication issued by an SSF to request the authorization of thecalling user.

FIG. 292 is a table representing the detail of a USER PROFILE RETRIEVALrequest indication used to request the user profile to be retrieved.

FIG. 293 is a table representing the detail of a USER PROFILE RETRIEVALresponse confirmation.

FIG. 294 is a table representing the detail of a CALL SETUP PERMISSIONresponse confirmation issued by the LRCF to inform the calling user isauthorized.

FIG. 295 is a table representing the detail of a SETUP requestindication used to request the establishment of a connection.

FIG. 296 is a table representing the detail of a PROCEEDING requestindication.

FIG. 297 is a table representing the detail of a MEASUREMENT CONDITIONNOTIFICATION request indication used by the network to indicateconditions, which the mobile terminal measures, and to report the cellselection information.

FIG. 298 is a table representing the detail of another MEASUREMENTCONDITION NOTIFICATION request indication used by the network toindicate conditions, which the mobile terminal measures, and to reportcell selecting information.

FIG. 299 is a table representing the detail of a REPORT requestindication used to report status and/or other types of information (e.g.alerting, suspended, hold, and resume) transported within the network.

FIG. 300 is a table representing the detail of another REPORT requestindication used to report status and/or other types of information (e.g.alerting, suspended, hold, and resume) transported within the network.

FIG. 301 is a table representing the detail of a SETUP responseconfirmation used to confirm that the connection has been established.

FIG. 302 is a table representing the detail of another SETUP responseconfirmation used to confirm that the connection has been established.

FIG. 303 is a table representing the detail of a SETUP requestindication used to report the establishment of a connection.

FIG. 304 is a table representing the detail of a ROUTING INFORMATIONQUERY request indication used to inquire the routing information.

FIG. 305 is a table representing the detail of a TERMINAL ID RETRIEVALrequest indication used to request the user profile to be retrieved.

FIG. 306 is a table representing the detail of a TERMINAL ID RETRIEVALresponse confirmation that is the response to the TERMINAL ID RETRIEVALrequest indication.

FIG. 307 is a table representing the detail of a TERMINAL STATUS QUERYrequest indication used to inquire the terminal status (e.g. if terminalaccess is active or not).

FIG. 308 is a table representing the detail of a TERMINAL STATUS QUERYresponse confirmation that is the response to the TERMINAL STATUS QUERYrequest indication.

FIG. 309 is a table representing the detail of a TERMINAL STATUS UPDATErequest indication used to update the terminal status.

FIG. 310 is a table representing the detail of a TERMINAL STATUS UPDATEresponse confirmation that is the response to the TERMINAL STATUS UPDATErequest indication.

FIG. 311 is a table representing the detail of a PAGING AREA QUERYrequest indication used to inquire the paging area where TACF resideswhen it is observed that the terminal access is not active. FIG. 312 isa table representing the detail of a PAGING AREA QUERY responseconfirmation is the response to the PAGING AREA QUERY requestindication.

FIG. 313 is a table representing the detail of a PAGE request indicationused to trigger a TACF of paging.

FIG. 314 is a table representing the detail of a PAGING requestindication used to page a mobile terminal for determining its positionin the network and for the routing for a call.

FIG. 315 is a table representing the detail of a PAGING responseconfirmation used to respond to the request indication.

FIG. 316 is a table representing the detail of a PAGE responseconfirmation that is the response to the request indication and notifiesa LRCF of the paging result.

FIG. 317 is a table representing the detail of a REVERSE LONG CODERETRIEVAL request indication used to retrieve the reverse long code.

FIG. 318 is a table representing the detail of another REVERSE LONG CODERETRIEVAL request indication used to retrieve the reverse long code.

FIG. 319 is a table representing the detail of a REVERSE LONG CODERETRIEVAL response confirmation used to retrieve the reverse long code.

FIG. 320 is a table representing the detail of a CELL CONDITIONMEASUREMENT request indication used by the MRRC to trigger themeasurement of cell selecting information.

FIG. 321 is a table representing the detail of a CELL CONDITIONMEASUREMENT response confirmation provides the result of the cellselection information measurement requested by the CELL CONDITIONMEASUREMENT request indication.

FIG. 322 is a table representing the detail of a CELL CONDITION REPORTrequest indication used by the mobile terminal to report the cellselection information.

FIG. 323 is a table representing the detail of an ADD-ROUTINGINFORMATION request indication sent to the LRDFp to add the routinginformation to the subscriber's profile.

FIG. 324 is a table representing the detail of an ADD-ROUTINGINFORMATION response confirmation that is the response to theADD-ROUTING INFORMATION request indication.

FIG. 325 is a table representing the detail of a PAGE AUTHORIZED requestindication at relationship rg used to notify the TACF of the result ofthe terminal authentication.

FIG. 326 is a table representing the detail of a REVERSE LONG CODERETRIEVAL response confirmation used to retrieve the reverse long code.

FIG. 327 is a table representing the detail of a ROUTING INFORMATIONQUERY response confirmation that is the response to the requestindication.

FIG. 328 is a table representing the detail of a SETUP requestindication used to request the establishment of a connection.

FIG. 329 is a table representing the detail of a TERMINATION ATTEMPTrequest indication used to request the user's profile which may beneeded to proceed the call process.

FIG. 330 is a table representing the detail of a USER PROFILE RETRIEVALrequest indication used to retrieve the called user's profile from theLRDF.

FIG. 331 is a table representing the detail of a USER PROFILE RETRIEVALresponse confirmation that is the response to the request indicationfrom the LRCF.

FIG. 332 is a table representing the detail of a TERMINATION ATTEMPTresponse confirmation that is the response to the request indicationfrom the SSF.

FIG. 333 is a table representing the detail of a SETUP requestindication used to request the establishment of a connection.

FIG. 334 is a table representing the detail of a PROCEEDING requestindication optionally reports that the received connection setup isvalid and authenticated and that further routing and progressing of thecall is proceeding.

FIG. 335 is a table representing the detail of a MEASUREMENT CONDITIONNOTIFICATION request indication used by the network to indicateconditions, which the mobile terminal measures, and to report the cellselection information.

FIG. 336 is a table representing the detail of a REPORT requestindication used to report status and/or other types of informationtransported in the network.

FIG. 337 is a table representing the detail of a SETUP responseconfirmation used to confirm that the connection has been established.

FIG. 338 is a table representing the detail of a CONNECTED requestindication used to acknowledge that a previously sent SETUP responseconfirmation has been received and accepted.

FIG. 339 is a table representing the detail of a RELEASE requestindication used to release the resources associated with the callconnection, such as call ID and channels.

FIG. 340 is a table representing the detail of a RELEASE responseconfirmation used to indicate that all resources pervasively associatedwith the connection have been released.

FIG. 341 is a table representing the detail of a TA RELEASE requestindication used to inform an SCF that the attempt of call release hasbeen detected.

FIG. 342 is a table representing the detail of aTERMINAL-STATUS-MAKE-IDLE request indication used to idle the terminalcall status.

FIG. 343 is a table representing the detail of aTERMINAL-STATUS-MAKE-IDLE response confirmation that is the response tothe TERMINAL-STATUS-MAKE-IDLE request indication.

FIG. 344 is a table representing the detail of a TA RELEASE responseconfirmation used for the confirmation to the TA RELEASE requestindication.

FIG. 345 is a table representing the detail of a RELEASE requestindication used to release the resources associated with the callconnection such as the call reference and channels.

FIG. 346 is a table representing the detail of a RELEASE responseconfirmation used to indicate that all resources previously associatedwith the connection have been released.

FIG. 347 is a table representing the detail of a TA RELEASE requestindication issued by the TACF to inform the LRCF that the attempt ofcall release has been detected.

FIG. 348 is a table representing the detail of aTERMINAL-STATUS-MAKE-IDLE request indication used to idle the terminalcall status.

FIG. 349 is a table representing the detail of aTERMINAL-STATUS-MAKE-IDLE response confirmation that is the response tothe TERMINAL-STATUS-MAKE-IDLE request indication.

FIG. 350 is a table representing the detail of a TA RELEASE responseconfirmation used for a confirmation of the TERMINAL-STATUS-MAKE-IDLErequest indication.

FIG. 351 is a table representing the detail of a RADIO LINK FAILURErequest indication used to notify a radio link failure detected by aBCAF or BCFr.

FIG. 352 is a table representing the detail of a RELEASE NOTIFICATIONrequest indication used to indicate that a connection between thenetwork and the terminal has been released.

FIG. 353 is a table representing the detail of a RADIO LINK FAILURErequest indication used to notify that the link failure has beendetected.

FIG. 354 is a table representing the detail of another RADIO LINKFAILURE request indication used to notify that the link failure has beendetected.

FIG. 355 is a table representing the detail of a RADIO LINK FAILUREresponse confirmation that is a response confirmation of the RADIO LINKFAILURE request indication.

FIG. 356 is a table representing the detail of a RADIO BEARER RELEASErequest indication used to request to release radio bearers.

FIG. 357 is a table representing the detail of a BEARER RELEASE requestindication issued by the TACF to the BCF to release the radio bearer.

FIG. 358 is a table representing the detail of a BEARER RELEASE responseconfirmation that is a response confirmation of the BEARER RELEASErequest indication.

FIG. 359 is a table representing the detail of another BEARER RELEASErequest indication sent by an anchor TACF to request a serving TACF torelease the bearer involved in the call that should be released.

FIG. 360 is a table representing the detail of another BEARER RELEASErequest indication issued by the TACF to BCF to release the radiobearer.

FIG. 361 is a table representing the detail of another BEARER RELEASEresponse confirmation that is a response confirmation of the BEARERRELEASE request indication.

FIG. 362 is a table representing the detail of a BEARER-AND-RADIO-BEARERRELEASE request indication issued by the TACF to release thebearer-and-radio-bearer.

FIG. 363 is a table representing the detail of a BEARER-AND-RADIO-BEARERRELEASE response confirmation used for a confirmation of the release ofthe bearer-and-radio-bearer requested by the BEARER-AND-RADIO-BEARERRELEASE request indication.

FIG. 364 is a table representing the detail of another BEARER RELEASEresponse confirmation that is a confirmation response to inform the TACFthat the previous request to release the radio bearer has beencompleted.

FIG. 365 is a table representing the detail of a TA RELEASE requestindication issued by the TACF to inform the LRCF that the attempt ofreleasing call has detected.

FIG. 366 is a table representing the detail of aTERMINAL-STATUS-MAKE-IDLE request indication used to request to updatethe user profile.

FIG. 367 is a table representing the detail of aTERMINAL-STATUS-MAKE-IDLE response confirmation that is a response tothe TERMINAL-STATUS-MAKE-IDLE request indication.

FIG. 368 is a table representing the detail of a TA RELEASE responseconfirmation used for a response confirmation of the TA RELEASE requestindication.

FIG. 369 is a table representing the detail of a RADIO LINK FAILURErequest indication used to notify that a link failure has been detectedand reported by either BCFr or BCFa.

FIG. 370 is a table representing the detail of another RADIO LINKFAILURE request indication used to notify that the link failure has beendetected.

FIG. 371 is a table representing the detail of a RADIO LINK FAILUREresponse confirmation that is a confirmation response to the RADIO LINKFAILURE request indication.

FIG. 372 is a table representing the detail of a RADIO BEARER RELEASErequest indication used to request to release the radio bearer.

FIG. 373 is a table representing the detail of a RELEASE NOTIFICATIONrequest indication used to indicate that the connection between thenetwork and the terminal has been released.

FIG. 374 is a table representing the detail of a RADIO BEARER RELEASEresponse confirmation that is a response confirmation of the RADIOBEARER RELEASE request indication.

FIG. 375 is a table representing the detail of a BEARER RELEASE requestindication issued by the TACF to BCF to release the radio bearer.

FIG. 376 is a table representing the detail of a BEARER RELEASE responseconfirmation that is a response confirmation of the BEARER RELEASErequest indication.

FIG. 377 is a table representing the detail of another BEARER RELEASErequest indication sent by the anchor TACF to request the serving TACFto release the radio bearer involved in the call that should bereleased.

FIG. 378 is a table representing the detail of another BEARER RELEASErequest indication issued by the TACF to BCF to release the radiobearer.

FIG. 379 is a table representing the detail of a BEARER RELEASE responseconfirmation that is a response confirmation of the BEARER RELEASErequest indication.

FIG. 380 is a table representing the detail of a BEARER-AND-RADIO-BEARERRELEASE request indication issued by the TACF to release the bearer andradio bearer.

FIG. 381 is a table representing the detail of a BEARER-AND-RADIO-BEARERRELEASE response confirmation used for a confirmation of the release ofthe bearer and radio bearer requested by the BEARER-AND-RADIO-BEARERRELEASE request indication.

FIG. 382 is a table representing the detail of another BEARER RELEASEresponse confirmation that is a confirmation response for informing theTACF that the previous request to release the radio bearer has beencompleted.

FIG. 383 is a table representing the detail of a RADIO BEARER RELEASErequest indication issued to request to release the radio bearer.

FIG. 384 is a table representing the detail of another RADIO BEARERRELEASE response confirmation used to confirm the release of radiobearer requested by the RADIO BEARER RELEASE request indication.

FIG. 385 is a table representing the detail of a TA RELEASE requestindication issued by the TACF to inform the LRCF that the attempt ofcall release has been detected.

FIG. 386 is a table representing the detail of aTERMINAL-STATUS-MAKE-IDLE request indication used to request to updatethe user profile.

FIG. 387 is a table representing the detail of aTERMINAL-STATUS-MAKE-IDLE response confirmation that is a response tothe TERMINAL-STATUS-MAKE-IDLE request indication.

FIG. 388 is a table representing the detail of another TA RELEASEresponse confirmation is used for confirmation to the TA RELEASE requestindication.

FIG. 389 is a table representing the detail of a CALL DISCONNECT requestindication used to notify the LRCF that a “user disconnect” has beendetected.

FIG. 390 is a table representing the detail of a USER-PROFILE-UPDATErequest indication used to request to update the user profile.

FIG. 391 is a table representing the detail of a USER-PROFILE-UPDATEresponse confirmation that is a response to the USER-PROFILE-UPDATEresponse confirmation.

FIG. 392 is a table representing the detail of a CALL DISCONNECTresponse confirmation that is a response to the request made by the CALLDISCONNECT request indication.

FIG. 393 is a table representing the detail of a SIGNALING CHANNEL SETUPREQUEST request indication used by the MCF and TACF to request thenetwork to setup the signaling channels.

FIG. 394 is a table representing the detail of a SIGNALING CHANNEL SETUPrequest indication used by an SCMAF to request to the network toallocate the signaling channels.

FIG. 395 is a table representing the detail of a SIGNALING CHANNEL SETUPresponse confirmation used by the SCMF to allocate the radio resourcesto the signaling channels.

FIG. 396 is a table representing the detail of a SIGNALING CHANNEL SETUPREQUESTED request indication used to indicate the reception of thesignaling channel setup request (initial access detection) from themobile terminal and to request the network to setup the correspondingsignaling channels in the network.

FIG. 397 is a table representing the detail of a SIGNALING CONNECTIONSETUP request indication used by the TACF and SACF to setup thesignaling connection among them and the SCMF.

FIG. 398 is a table representing the detail of a SIGNALING CONNECTIONSETUP response confirmation used to report the establishment of thesignaling channels including the physical radio channel and theintra-network channel.

FIG. 399 is a table representing the detail of a SIGNALING CHANNEL SETUPREQUEST response confirmation used by the SCMAF to report the setup ofthe signaling channels to the network.

FIG. 400 is a table representing the detail of a BEARER SETUP requestindication used to request the establishment of the access bearer fromthe CCF to TACF.

FIG. 401 is a table representing the detail of a CHANNEL SELECTIONresponse confirmation used to report reserved radio resources to theTACF, which requested the reservation.

FIG. 402 is a table representing the detail of a BEARER SETUP requestindication sent from the TACF to BCF to request the establishment of theaccess bearer.

FIG. 403 is a table representing the detail of a BEARER SETUP responseconfirmation sent to confirm the establishment of the access bearer andto indicate the bearer ID of the bearer between the BCF and BCF.

FIG. 404 is a table representing the detail of another BEARER SETUPrequest indication used to request the establishment of the accessbearer from the TACFa to TACFv.

FIG. 405 is a table representing the detail of another BEARER SETUPrequest indication sent from the TACF to BCF to request theestablishment of the access bearer.

FIG. 406 is a table representing the detail of another BEARER SETUPresponse confirmation sent from the BCF to TACF to request theestablishment of the access bearer.

FIG. 407 is a table representing the detail of a BEARER-AND-RADIO-BEARERSETUP request indication sent from the TACF to BCFr to request theestablishment of the radio bearer and the bearer between the BCF andBCFr.

FIG. 408 is a table representing the detail of a RADIO BEARER SETUPPROCEEDING request indication used by the BCFr to report that theinstructed radio bearer setup is valid and the establishment of theradio bearer is proceeding.

FIG. 409 is a table representing the detail of a RADIO BEARER SETUPREQUEST request indication issued by the TACF, which controls a newaccess bearer, to the TACF, which has the signaling connection, torequest to newly assign a radio bearer to the mobile terminal.

FIG. 410 is a table representing the detail of a RADIO BEARER SETUPrequest indication sent from the TACF to TACAF to request theestablishment of the radio bearer.

FIG. 411 is a table representing the detail of another RADIO BEARERSETUP request indication sent from the TACAF to BCAF to request theestablishment of the radio bearer.

FIG. 412 is a table representing the detail of a RADIO BEARER SETUPresponse confirmation sent from the BCAF to TACAF to confirm that theestablishment of radio bearer has been completed.

FIG. 413 is a table representing the detail of a BEARER-AND-RADIO-BEARERSETUP response confirmation sent to confirm that the establishment ofradio bearer and bearer between the BCF and BCFr have been completed.

FIG. 414 is a table representing the detail of a BEARER SETUP responseconfirmation used to confirm that the establishment of access bearer hasbeen completed.

FIG. 415 is a table representing the detail of another BEARER SETUPresponse confirmation used to confirm that the establishment of accessbearer has been completed.

FIG. 416 is a table representing the detail of a BEARER RELEASE requestindication sent by an anchor CCF to notify an anchor TACF that theattempt or event of call release has been detected and that the bearerinvolved in the call is being released.

FIG. 417 is a table representing the detail of a RADIO BEARER RELEASErequest indication used by the TACFa to request to release the radiobearer.

FIG. 418 is a table representing the detail of a RADIO BEARER RELEASEresponse confirmation that is a response confirmation of the RADIOBEARER RELEASE request indication.

FIG. 419 is a table representing the detail of a BEARER RELEASE requestindication issued by the TACF to BCF to release the radio bearer.

FIG. 420 is a table representing the detail of a BEARER RELEASE responseconfirmation that is a response confirmation of the BEARER RELEASErequest indication.

FIG. 421 is a table representing the detail of another BEARER RELEASErequest indication sent by the TACFa to request the TACFv to release thebearer involved in the call is being released.

FIG. 422 is a table representing the detail of another BEARER RELEASErequest indication issued by the TACF to BCF to release the radiobearer.

FIG. 423 is a table representing the detail of a BEARER RELEASE responseconfirmation that is a response confirmation of the BEARER RELEASErequest indication.

FIG. 424 is a table representing the detail of a BEARER-AND-RADIO-BEARERRELEASE request indication issued by the TACF to release the bearer andradio bearer.

FIG. 425 is a table representing the detail of a BEARER-AND-RADIO-BEARERRELEASE response confirmation used for a confirmation of the release ofthe bearer and radio bearer requested by the BEARER-AND-RADIO-BEARERRELEASE request indication.

FIG. 426 is a table representing the detail of another BEARER RELEASEresponse confirmation that is a confirmation of the BEARER RELEASErequest indication.

FIG. 427 is a table representing the detail of another BEARER RELEASEresponse confirmation that is a response confirmation to inform the CCFthat the previous request to release the radio bearer has beencompleted.

FIG. 428 is a table representing the detail of another RADIO BEARERRELEASE request indication issued by the TACAF to request the radiobearer release.

FIG. 429 is a table representing the detail of another RADIO BEARERRELEASE request indication used by the BOCA to confirm the radio bearerrelease requested by the RADIO BEARER RELEASE request indication.

FIG. 430 is a table representing the detail of a SIGNALING CHANNELRELEASE REQUEST request indication used by the MCF and TACF to requestthe release of a signaling channel.

FIG. 431 is a table representing the detail of a SIGNALING CONNECTIONRELEASE request indication used by the TACF and SACF to request therelease of the signaling channel (in both of the network and the radioresources).

FIG. 432 is a table representing the detail of a SIGNALING CONNECTIONRELEASE response confirmation used to report the release of thesignaling channel.

FIG. 433 is a table representing the detail of a BEARER SETUP requestindication sent from the TACFa to TACFv to request the setup of anaccess bearer.

FIG. 434 is a table representing the detail of an INTRA-BCFr HANDOVERBRANCH ADDITION request indication.

FIG. 435 is a table representing the detail of an INTRA-BCFr HANDOVERBRANCH ADDITION response confirmation that is a response to theINTRA-BCFr HANDOVER BRANCH ADDITION request indication and is sent fromthe BCFr to TACF to indicate the completion of setup of the physicalradio channel(s).

FIG. 436 is a table representing the detail of a RADIO BEARER SETUPREQUEST request indication sent from the visited TACF, which controlsthe newly assigned radio bearer, to TACFa to request to setup the radiobearer between the mobile terminal and BCFr controlled by the visitedTACF.

FIG. 437 is a table representing the detail of a HANDOVER BRANCHADDITION request indication sent from the TACF to TACAF to notify of theintra-BCFr handover branch addition, and requesting to add a newphysical radio channel to an existing physical radio channel.

FIG. 438 is a table representing the detail of a RADIO BEARER SETUPrequest indication sent from the TACAF to BCAF to request to setup aradio bearer.

FIG. 439 is a table representing the detail of a RADIO BEARER SETUPresponse confirmation that is a response to the RADIO BEARER SETUPrequest indication sent from the BCAF to TACAF to indicate thecompletion of the radio bearer setup.

FIG. 440 is a table representing the detail of a HANDOVER CONNECTIONSETUP request indication notifying of a handover initiation and torequest to setup an access bearer.

FIG. 441 is a table representing the detail of a HANDOVER CONNECTIONSETUP response confirmation sent from the BCF to TACF to confirm theHANDOVER CONNECTION SETUP request indication.

FIG. 442 is a table representing the detail of a BEARER SETUP requestindication sent from the TACFa to TACFv to setup an access bearer.

FIG. 443 is a table representing the detail of another BEARER SETUPrequest indication sent from the TACF to BCF to request the bearersetup.

FIG. 444 is a table representing the detail of a BEARER SETUP responseconfirmation sent from the BCF to TACF to confirm the BEARER SETUPrequest indication.

FIG. 445 is a table representing the detail of a BEARER-AND-RADIO-BEARERSETUP request indication.

FIG. 446 is a table representing the detail of a BEARER-AND-RADIO-BEARERSETUP response confirmation sent from the BCFr to TACF to indicate thecompletion of setting up of the radio bearer and bearer between the BCFrand BCF.

FIG. 447 is a table representing the detail of a RADIO BEARER SETUPREQUEST request indication sent from the visited TACF, which controlsthe newly assigned radio bearer, to the TACFa to request to setup theradio bearer between the mobile terminal and BCFr.

FIG. 448 is a table representing the detail of a HANDOVER BRANCHADDITION request indication notifying of the handover branch additionrequest.

FIG. 449 is a table representing the detail of a RADIO BEARER SETUPrequest indication sent from the TACAF to BCAF.

FIG. 450 is a table representing the detail of a RADIO BEARER SETUPresponse confirmation sent from the BCAF to TACAF to indicate thecompletion of the radio bearer setup.

FIG. 451 is a table representing the detail of a BEARER SETUP responseconfirmation sent from the TACFa to TACFv to confirm the establishmentof the access bearer.

FIG. 452 is a table representing the detail of a HANDOVER BRANCHDELETION request indication.

FIG. 453 is a table representing the detail of a HANDOVER BRANCHDELETION response confirmation sent from the TACAF to TACF to confirmthe HANDOVER BRANCH DELETION request indication.

FIG. 454 is a table representing the detail of a BEARER RELEASE requestindication sent from the TACFa to TACFv to release the access bearer.

FIG. 455 is a table representing the detail of an INTRA-BCFr HANDOVERBRANCH DELETION request indication sent from the TACF to BCFr to requestthe release of the physical radio channel(s).

FIG. 456 is a table representing the detail of an INTRA-BCFr HANDOVERBRANCH DELETION response confirmation sent from the BCFr to TACF toindicate the release of the physical radio channel(s).

FIG. 457 is a table representing the detail of a BEARER RELEASE responseconfirmation sent from the TACFv to TACFa to confirm the BEARER RELEASErequest indication.

FIG. 458 is a table representing the detail of a HANDOVER BRANCHDELETION request indication sent from the TACF to TACAF.

FIG. 459 is a table representing the detail of a HANDOVER BRANCHDELETION response confirmation sent from the TACAF to TACF to confirmthe HANDOVER BRANCH DELETION request indication.

FIG. 460 is a table representing the detail of a RADIO BEARER RELEASErequest indication sent from the TACAF to BCAF to request the radiobearer release.

FIG. 461 is a table representing the detail of a RADIO BEARER RELEASEresponse confirmation sent from the BCFr to TACAF to indicate thecompletion of the radio bearer release.

FIG. 462 is a table representing the detail of a HANDOVER CONNECTIONRELEASE request indication sent from the TACF to BCF to release theindicated bearer in the diversity handover state.

FIG. 463 is a table representing the detail of a HANDOVER CONNECTIONRELEASE response confirmation sent from the BCF to TACF to confirm theHANDOVER CONNECTION RELEASE request indication.

FIG. 464 is a table representing the detail of a BEARER RELEASE requestindication sent from the TACFa to TACFv to release the access bearer.

FIG. 465 is a table representing the detail of another BEARER RELEASErequest indication sent from the TACF to BCF to request the bearerrelease.

FIG. 466 is a table representing the detail of a BEARER RELEASE responseconfirmation sent from the BCF to TACF to confirm the BEARER RELEASErequest indication.

FIG. 467 is a table representing the detail of a BEARER-AND-RADIO-BEARERRELEASE request indication sent from the TACF to BCFr to request thebearer between the BCF and BCFr and the radio bearer.

FIG. 468 is a table representing the detail of a BEARER-AND-RADIO-BEARERRELEASE response confirmation sent from the BCFr to TACF to indicate thecompletion of the release of the bearer and the radio bearer.

FIG. 469 is a table representing the detail of a BEARER RELEASE responseconfirmation sent from the TACFv to TACFa to confirm the BEARER RELEASErequest indication.

FIG. 470 is a table representing the detail of a BEARER SETUP requestindication sent from the TACFa to TACFv to setup an access bearer.

FIG. 471 is a table representing the detail of an INTRA-BCFr HANDOVERBRANCH REPLACEMENT response confirmation sent from the BCFr to TACF toindicate the completion of the setup of the physical radio channel(s).

FIG. 472 is a table representing the detail of an INTRA-BCFr HANDOVERBRANCH REPLACEMENT PROCEEDING request indication sent from the BCFr toTACF to indicate that the request of the handover branch replacement isaccepted.

FIG. 473 is a table representing the detail of a RADIO BEARER SETUPREQUEST request indication sent from the visited TACF, which controlsthe newly assigned radio bearer, to the anchor TACFa to request to setupthe radio bearer between the mobile terminal and BCFr controlled by thevisited TACF.

FIG. 474 is a table representing the detail of a NON-SOFT HANDOVEREXECUTION request indication sent from the TACF to TACAF to notify of anon-soft handover execution request initiation.

FIG. 475 is a table representing the detail of a RADIO BEARER SETUPrequest indication sent from the TACAF to BCAF to request to setup aradio bearer.

FIG. 476 is a table representing the detail of a RADIO BEARER SETUPresponse confirmation sent from the BCAF to TACAF to indicate thecompletion of the radio bearer setup.

FIG. 477 is a table representing the detail of a RADIO BEARER RELEASErequest indication sent from the TACAF to BCAF to request the radiobearer release.

FIG. 478 is a table representing the detail of a RADIO BEARER RELEASEresponse confirmation sent from the BCAF to TACAF to indicate thecompletion of the radio bearer release.

FIG. 479 is a table representing the detail of a BEARER SETUP responseconfirmation sent from the TACFa to TACFv to confirm the establishmentof the access bearer.

FIG. 480 is a table representing the detail of a HANDOVER CONNECTIONSETUP request indication sent from the TACFa to BCFa to notify of ahandover initiation.

FIG. 481 is a table representing the detail of a HANDOVER CONNECTIONSETUP response confirmation sent from the BCF to TACF to confirm theHANDOVER CONNECTION SETUP request indication.

FIG. 482 is a table representing the detail of a BEARER SETUP requestindication sent from the TACFa to TACFv to set up a new handover link.

FIG. 483 is a table representing the detail of another BEARER SETUPrequest indication sent from the TACF to BCF to request a new handoverlink in the network.

FIG. 484 is a table representing the detail of a BEARER SETUP responseconfirmation sent from the BCF to TACF to confirm a BEARER SETUP requestindication.

FIG. 485 is a table representing the detail of a BEARER-AND-RADIO-BEARERSETUP request indication sent from the TACF to BCFr to request to set upa bearer between the BCF and BCFr and a radio bearer.

FIG. 486 is a table representing the detail of a RADIO BEARER SETUPPROCEEDING request indication sent from the BCFr to TACF to indicatethat the request of the access radio link setup is accepted and that theBCFr starts setting up the access radio link.

FIG. 487 is a table representing the detail of a RADIO BEARER SETUPREQUEST request indication.

FIG. 488 is a table representing the detail of a NON-SOFT HANDOVEREXECUTION request indication sent from the TACF to TACAF to notify of aNON-SOFT HANDOVER EXECUTION request indication.

FIG. 489 is a table representing the detail of a RADIO BEARER SETUPrequest indication sent from the TACAF to BCAF to request to set up anaccess radio link.

FIG. 490 is a table representing the detail of a RADIO BEARER SETUPresponse confirmation sent from the BCAF to TACAF to indicate thecompletion of the setup of the access radio link.

FIG. 491 is a table representing the detail of a RADIO BEARER RELEASErequest indication sent from the TACAF to BCAF to request to release theaccess radio link.

FIG. 492 is a table representing the detail of a RADIO BEARER RELEASEresponse confirmation sent from the BCAF to TACAF to request to releasethe access radio link.

FIG. 493 is a table representing the detail of a BEARER-AND-RADIO-BEARERSETUP response confirmation sent from the BCFr to TACF to indicate thecompletion of the setup of the access radio link and the link betweenthe BCFr and BCF.

FIG. 494 is a table representing the detail of a BEARER SETUP responseconfirmation sent from the TACFa to TACFv to confirm the establishmentof the handover link.

FIG. 495 is a table representing the detail of a HANDOVER CONNECTIONRELEASE request indication sent from the TACF to BCFa to request toremove the indicated handover link.

FIG. 496 is a table representing the detail of a HANDOVER CONNECTIONRELEASE response confirmation sent from the BCF to TACF to confirm theHANDOVER CONNECTION RELEASE request indication.

FIG. 497 is a table representing the detail of a BEARER RELEASE requestindication sent from the TACFa to TACFv to request to release thehandover link in the network.

FIG. 498 is a table representing the detail of another BEARER RELEASErequest indication sent from the TACF to BCF to request to release thehandover link in the network.

FIG. 499 is a table representing the detail of a BEARER RELEASE responseconfirmation sent from the BCF to TACF to confirm the BEARER RELEASErequest indication.

FIG. 500 is a table representing the detail of a BEARER-AND-RADIO-BEARERRELEASE request indication sent from the TACF to BCFr to request torelease the access link or handover link between the BCF and BCFr andbetween BCAF and BCF.

FIG. 501 is a table representing the detail of a BEARER-AND-RADIO-BEARERRELEASE response confirmation sent from the BCFr to TACF to indicate thecompletion of the release of the access link or hand over link.

FIG. 502 is a table representing the detail of a BEARER RELEASE responseconfirmation sent from the TACFv to TACFa to confirm the BEARER RELEASErequest indication.

FIG. 503 is a table representing the detail of a HANDOVER CONNECTIONSETUP request indication sent from a TACFa to a BAFa to notify of ahandover initiation and to request to setup an ACCH.

FIG. 504 is a table representing the detail of a HANDOVER CONNECTIONSETUP response confirmation sent from the BCF to the TACFa to confirmthe HANDOVER CONNECTION SETUP request indication.

FIG. 505 is a table representing the detail of a BEARER SETUP requestindication sent from the TACFa to a TACFv to setup an access bearer forthe ACCH.

FIG. 506 is a table representing the detail of another BEARER SETUPrequest indication sent from the TACFv to the BCF to setup an accessbearer for the ACCH.

FIG. 507 is a table representing the detail of a BEARER SETUP responseconfirmation sent from the BCF to the TACFv to confirm the BEARER SETUPrequest indication.

FIG. 508 is a table representing the detail of a BEARER-AND-RADIO-BEARERSETUP request indication sent from the TACFv to the BCFr.

FIG. 509 is a table representing the detail of a RADIO BEARER SETUPPROCEEDING request indication sent from the BCFr to the TACFv.

FIG. 510 is a table representing the detail of a RADIO BEARER SETUPREQUEST request indication.

FIG. 511 is a table representing the detail of another RADIO BEARERSETUP request indication sent from the TACFa to TACAF.

FIG. 512 is a table representing the detail of another RADIO BEARERSETUP request indication sent from the TACAF to BCAF.

FIG. 513 is a table representing the detail of a RADIO BEARER SETUPresponse confirmation sent from the BCAF to the TACAF to indicate thecompletion of the radio bearer setup for the new ACCH.

FIG. 514 is a table representing the detail of a RADIO BEARER RELEASErequest indication sent from the TACAF to another BCAF to request torelease a previous radio bearer.

FIG. 515 is a table representing the detail of a RADIO BEARER RELEASEresponse confirmation sent from the BCAF to the TACAF to indicate thecompletion of the radio bearer release.

FIG. 516 is a table representing the detail of a HANDOVER CONNECTIONRELEASE request indication sent from the TACFa to the BCFa to request toremove the previous bearer in the soft handover state.

FIG. 517 is a table representing the detail of a HANDOVER CONNECTIONRELEASE response confirmation sent from the BCF to the TACF to confirmthe HANDOVER CONNECTION RELEASE request indication.

FIG. 518 is a table representing the detail of a BEARER RELEASE requestindication sent from the TACFa to TACFv to request to release the accessbearer

FIG. 519 is a table representing the detail of another BEARER RELEASErequest indication sent from the TACF to BCF to request to release thebearer.

FIG. 520 is a table representing the detail of a BEARER RELEASE responseconfirmation sent from the BCF to the TACF to confirm the BEARER RELEASErequest indication.

FIG. 521 is a table representing the detail of a BEARER-AND-RADIO-BEARERRELEASE request indication sent from the TACF to BCFr to request torelease the bearer between the BCF and BCFr and the radio bearer.

FIG. 522 is a table representing the detail of a BEARER-AND-RADIO-BEARERRELEASE response confirmation sent from the BCFr to TACAF to indicatethe completion of the release of the bearer and radio bearer.

FIG. 523 is a table representing the detail of a BEARER RELEASE responseconfirmation sent from the TACFv to TACFa to confirm the BEARER RELEASErequest indication.

FIG. 524 is a table representing the detail of a CODE REPLACEMENTrequest indication sent from a BCFr to a TACF to request change ofcodes.

FIG. 525 is a table representing the detail of another CODE REPLACEMENTrequest indication sent from the visited TACF to a TACFa to requestchange of codes.

FIG. 526 is a table representing the detail of another CODE REPLACEMENTrequest indication sent from the TACF to a TACAF to request change ofcodes.

FIG. 527 is a table representing the detail of another CODE REPLACEMENTrequest indication sent from the TACAF to the BCAF to request to changeof codes.

FIG. 528 is a table representing the detail of a CODE REPLACEMENTresponse confirmation sent from the BCAF to the TACAF to indicate thecompletion of the change of codes.

FIG. 529 is a table representing the detail of another CODE REPLACEMENTresponse confirmation sent from the TACAF to the TACFa to confirm theCODE REPLACEMENT request indication.

FIG. 530 is a table representing the detail of another CODE REPLACEMENTresponse confirmation sent from the TACFa to the TACFv to confirm theCODE REPLACEMENT request indication.

FIG. 531 is a table representing the detail of another CODE REPLACEMENTresponse confirmation sent from the TACF to the BCFr to confirm the CODEREPLACEMENT request indication.

FIG. 532 is a table representing the detail of a CELL CONDITION REPORTrequest indication sent from an MRRC to an RRC periodically to notify ofthe radio conditions of respective handover branches.

FIG. 533 is a table representing the detail of a TRANSMISSION POWERCONTROL request indication sent from a TACFa to TACFv to notify of theinstructed transmission power.

FIG. 534 is a table representing the detail of another TRANSMISSIONPOWER CONTROL request indication sent from a TACFv to BCFr to notify ofthe instructed transmission power.

FIG. 535 is a table representing the detail of an LAI UPDATE requestindication sent from the visited SCF to the SDF.

FIG. 536 is a table representing the detail of a TERMINAL LOCATIONUPDATE request indication sent from the SACF to the visited SCF.

FIG. 537 is a table representing the detail of another TERMINAL LOCATIONUPDATE request indication sent from the MCF to the SACF.

FIG. 538 is a table representing the detail of an AUTHENTICATIONINFORMATION RETRIEVAL request indication and an AUTHENTICATIONINFORMATION RETRIEVAL response confirmation.

FIG. 539 is a table representing the detail of an AUTHENTICATIONCHALLENGE request indication and the AUTHENTICATION CHALLENGE responseconfirmation transported between the LRCF and TACF; and the LRCF andSACF.

FIG. 540 is a table representing the detail of an AUTHENTICATIONCHALLENGE request indication and an AUTHENTICATION CHALLENGE responseconfirmation transported between the TACF and TACAF; and the SACF andMCF.

FIG. 541 is a table representing the detail of an AUTHENTICATION requestindication and an AUTHENTICATION response confirmation.

FIG. 542 is a table representing the detail of a start ciphering IFtransported between the TACF and TACAF; and the LRCF to TACF.

FIG. 543 is a table representing the detail of another start cipheringIF transported between the LRCF and SACF.

FIG. 544 is a table representing the detail of a TMUI ASSIGNMENT requestindication and a TMUI ASSIGNMENT response confirmation transportedbetween the TACF and TACAF.

FIG. 545 is a table representing the detail of a TMUI QUERY requestindication and a TMUI QUERY response confirmation.

FIG. 546 is a table representing the detail of a TMUI MODIFY requestindication and a TMUI MODIFY response confirmation.

FIG. 547 is a table representing the detail of another TMUI ASSIGNMENTrequest indication and another TMUI ASSIGNMENT response confirmationtransported between the LRCF to TACF.

FIG. 548 is a table representing the detail of another TMUI ASSIGNMENTrequest indication and another TMUI ASSIGNMENT response confirmationtransported between the LRCF and SACF.

FIG. 549 is a table representing the detail of another TMUI ASSIGNMENTrequest indication and another TMUI ASSIGNMENT response confirmationtransported between the SACF and MCF.

FIG. 550 is a table representing the detail of an IMUI RETRIEVAL requestindication and an IMUI RETRIEVAL response confirmation transportedbetween the LRCF and LRDF.

FIG. 551 is a table representing the detail of another IMUI RETRIEVALrequest indication and another IMUI RETRIEVAL response confirmationtransported between the SACF and LRCF.

FIG. 552 is a table representing the detail of another IMUI RETRIEVALrequest indication and another IMUI RETRIEVAL response confirmationtransported between the MCF and SACF.

FIG. 553 is a table representing the detail of another IMUI RETRIEVALrequest indication and another IMUI RETRIEVAL response confirmationtransported between the TACF and LRCF.

FIG. 554 is a table representing the detail of another IMUI RETRIEVALrequest indication and another IMUI RETRIEVAL response confirmationtransported between the TACAF and TACF.

FIG. 555 is a table representing the detail of the service access pointidentifier in a layer 3 compatible sub-sub-layer PDU.

FIG. 556 is a table representing the detail of the ST in the layer 3compatible sub-sub-layer PDU.

FIG. 557 is a table representing the detail of the code type indicatorin the layer 3 compatible sub-sub-layer PDU.

FIG. 558 is a table representing the detail of the reserved parameter inthe layer 3 compatible sub-sub-layer PDU.

FIGS. 559 and 560 form a table representing various types of LLCprotocol data units (PDUs).

FIG. 561 is a table representing the relationship between the length ofCRC fields in an MAC PDU and channels through which corresponding frameis transmitted.

FIG. 562 is a table representing the bit coding of the ST field in alayer 1 frame and the meaning thereof.

FIG. 563 is a table representing the bit coding of the BI field in alayer 1 frame and the meaning thereof.

FIG. 564 is a table representing the bit coding of the uplinkinterference field in a layer 1 frame and the meaning thereof.

FIG. 565 is a table representing the relationship between the usage ofthe PID field in a layer 1 frame and the range of PID value.

FIG. 566 is a table representing the bit coding of the U/C field in alayer 1 frame and the meaning thereof.

FIG. 567 is a table representing the bit coding of the TN field in alayer 1 frame and the meanings thereof

FIG. 568 is a table representing the bit coding of the MO field in alayer 1 frame and the meanings thereof.

FIG. 569 is a table representing the relationship between the length ofCRC fields and channels through which corresponding frames aretransmitted.

FIG. 570 is a list representing various messages belonging to CC(call/connection control) entity message.

FIG. 571 through 573 form a list representing information elementsconstituting an alerting message.

FIG. 574 through 576 form a list representing information elementsconstituting a call proceeding message.

FIG. 577 through 581 form a list representing information elementsconstituting a connect message.

FIG. 582 is a list representing information elements constituting aconnect acknowledge message.

FIGS. 583 through 585 form a list representing information elementsconstituting a progress message.

FIGS. 586 through 594 form a list representing information elementsconstituting a setup message.

FIG. 595 is a list representing information elements constituting arelease message.

FIG. 596 is a list representing information elements constituting arelease complete message.

FIG. 597 is a list representing information elements constituting aninformation message.

FIG. 598 is a list representing a message (mobility facility message)belonging to the MM-T (terminal mobility management) entity message.

FIG. 599 is a list representing the generic formats of the mobilityfacility message.

FIGS. 600 and 601 form a list representing information elementsconstituting a mobility facility message transferred from a mobilestation to the network for requesting terminal location registration.

FIG. 602 is a list representing information elements constituting amobility facility message indicating “return result” issued when theterminal location has been normally registered.

FIG. 603 is a list representing information elements constituting amobility facility message indicating “return error” issued when anabnormality, for example, an application error has occurred.

FIG. 604 is a list representing information elements constituting amobility facility message indicating “return error” when an abnormality,for example, a discrepancy of an information element has occurred.

FIG. 605 is a list representing information elements constituting amobility facility message transferred for notifying a mobile station ofthe TMUI allocated to the mobile station.

FIG. 606 is a list representing information elements constituting amobility facility message indicating “return result” issued when theTMUI has been normally assigned.

FIG. 607 is a list representing information elements constituting amobility facility message indicating “return error” issued when anabnormality, for example, an application error has occurred.

FIG. 608 is a list representing information elements constituting amobility facility message indicating “return error” when an abnormality,for example, a discrepancy of an information element has occurred.

FIGS. 609 and 610 form a list representing information elementsconstituting a mobility facility message transferred from the network toa mobile station for authenticating the mobile station by the mobileservice switching center.

FIG. 611 is a list representing information elements constituting amobility facility message indicating “return result” issued when theauthentication has been normally requested.

FIG. 612 is a list representing information elements constituting amobility facility message indicating “return error” issued when anabnormality, for example, an application error has occurred.

FIG. 613 is a list representing information elements constituting amobility facility message indicating “return error” when an abnormality,for example, a discrepancy of an information element has occurred.

FIG. 614 is a list representing information elements constituting amobility facility message transferred for notifying a mobile station ofciphering onset.

FIG. 615 is a list representing information elements constituting amobility facility message indicating “return result” issued when theciphering onset has been normally notified.

FIG. 616 is a list representing information elements constituting amobility facility message indicating “return error” issued when anabnormality, for example, an application error has occurred.

FIG. 617 is a list representing information elements constituting amobility facility message indicating “return error” when an abnormality,for example, a discrepancy of an information element has occurred.

FIG. 618 is a list representing information elements constituting amobility facility message transferred for inquiring of a mobile stationas to the IMUI of the mobile station.

FIG. 619 is a list representing information elements constituting amobility facility message indicating “return result” issued when theIMUI has been normally inquired.

FIG. 620 is a list representing information elements constituting amobility facility message indicating “return error” issued when anabnormality, for example, an application error has occurred.

FIG. 621 is a list representing information elements constituting amobility facility message indicating “return error” when an abnormality,for example, a discrepancy of an information element has occurred.

FIG. 622 is a list representing messages belonging to RBC entitymessage.

FIG. 623 is a list representing classification of RBC entity message.

FIG. 624 is a list representing the format of radio bearer setupmessage.

FIG. 625 is a list representing the format of radio bearer releasemessage.

FIG. 626 is a list representing the format of radio bearer releasecomplete message.

FIG. 627 is a list representing the format of handover command message.

FIG. 628 is a list representing the format of handover response message.

FIG. 629 is a list representing a message (radio resource facilitymessage) belonging to RRC entity message.

FIG. 630 is a list representing the format of the RRC facility message.

FIG. 631 is a list representing TAC entity messages.

FIG. 632 is a list representing the relationship between TAC entitymessage and information flow.

FIG. 633 is a list representing the format of a terminal associationsetup message.

FIG. 634 is a list representing the format of a terminal associationconnect message.

FIG. 645 is a list representing the bit coding manner of a protocoldiscriminator in the CC entity message.

FIGS. 646 and 647 form a list representing the bit coding manner of amessage type identifier.

FIGS. 648 and 649 form a list representing the bit coding manner of avariable length information element according to FPLMTS.

FIG. 650 is a list representing the bit coding manner of a broadbandlocking shift information element.

FIG. 651 is a list representing the bit coding manner of a broadbandnon-locking shift information element.

FIGS. 652 through 654 form a list representing the bit coding manner ofan AAL parameter information element.

FIG. 655 is a list representing the bit coding manner of an ATM trafficdescriptor information element.

FIG. 656 is a list representing the bit coding manner of a broadbandbearer capability information element.

FIG. 657 is a list representing the bit coding manner of a broadbandhigh layer information element.

FIGS. 658 through 660 form a list representing the bit coding manner ofa broadband low layer information element.

FIG. 661 is a list representing the bit coding manner of a called partynumber information element.

FIG. 662 is a list representing the bit coding manner of a called partysub-address information element.

FIGS. 663 and 664 form a list representing the bit coding manner of acalling party number information element.

FIG. 665 is a list representing the bit coding manner of a calling partysub-address information element.

FIG. 666 is a list representing the bit coding manner of a connectionidentifier information element.

FIG. 667 is a list representing the bit coding manner of an end-to-endtransit delay information element.

FIG. 668 is a list representing the bit coding manner of a QOS parameterinformation element.

FIG. 669 is a list representing the bit coding manner of a broadbandrepeat indicator information element.

FIG. 670 is a list representing the bit coding manner of a transitnetwork selection information element.

FIG. 671 is a list representing the bit coding manner of an OAM trafficdescriptor information element.

FIG. 672 is a list representing the bit coding manner of an MM-Tspecific information elements.

FIG. 673 is a list representing parameters of a candidate zoneinformation for call attempt or acceptance.

FIG. 674 is a list representing parameters of an in-use zoneinformation.

FIG. 675 is a list representing parameters of an added zone informationfor DHO.

FIG. 676 is a list representing parameters of a deleted zone informationfor DHO.

FIG. 677 is a list representing parameters of a HHO zone information.

FIG. 678 is a list representing parameters of an outer loop information.

FIG. 679 is a list representing parameters of a quality deteriorationnotification information.

FIG. 680 is a list representing the bit coding manner of a TAC entitymessage.

FIG. 681 is a list representing TAC entity message specific parameters.

FIG. 682 is a list representing the bit coding manner of a terminalassociation setup message specific parameter.

FIG. 683 is a list representing the bit coding manner of a pagingresponse message specific parameter.

FIG. 684 is a list representing the bit coding manner of a terminalassociation release message specific parameter.

FIG. 685 is a list representing information elements which may becontained in subfields of TAC entity message specific parameters.

FIG. 686 is a list representing the bit coding manner of a causeinformation element.

FIG. 687 is a list representing the bit coding manner of a mobilestation type information element.

FIG. 688 is a list representing the bit coding manner of a paged MS IDinformation element.

FIG. 689 is a list representing the bit coding manner of a paging IDinformation element.

FIG. 690 is a list representing types of BC entity messages.

FIG. 691 is a list representing a classification of BC entity messages.

FIG. 692 is a list representing structural information elements of alink setup requested message.

FIG. 693 is a list representing structural information elements of alink setup message.

FIG. 694 is a list representing structural information elements of alink setup proceeding message.

FIG. 695 is a list representing structural information elements of alink setup response message.

FIG. 696 is a list representing structural information elements of alink facility message sent from the MSCNW to the BTS.

FIG. 697 is a list representing structural information elements ofanother link facility message sent from the BTS to the MSCNW.

FIG. 698 is a list representing structural information elements of alink release message.

FIG. 699 is a list representing structural information elements of alink release complete message.

FIG. 700 is a list representing the combinations of the fundamentalinformation elements in the link setup message in various uses.

FIG. 701 is a list representing the combinations of the fundamentalinformation elements in the link setup proceeding message in varioususes.

FIG. 702 is a list representing the combinations of the fundamentalinformation elements in the link setup response message in various uses.

FIGS. 703 and 704 form a list representing the combinations of thefundamental information elements in the link facility message in varioususes.

FIGS. 705 and 706 form a list representing the combinations of thefundamental information elements in the other link facility message invarious uses.

FIG. 707 is a list representing a message belonging to the BSM entitymessage.

FIG. 708 is a list representing structural information elements of apaging message.

FIG. 709 is a list representing the format of a link ID informationelement.

FIG. 710 is a list representing the format of a TCH setup requestinformation element without frequency indication.

FIG. 711 is a list representing the format of a TCH setup requestinformation element without frequency indication.

FIG. 712 is a list representing the format of a TCH setup requestinformation element with frequency indication.

FIG. 713 is a list representing the format of a DHO branch additionrequest information element.

FIG. 714 is a list representing the format of an intra-BS DHO branchaddition request information element.

FIG. 715 is a list representing the format of an ACCH setup requestinformation element.

FIG. 716 is a list representing the format of a TCH setup acceptanceinformation element without frequency indication.

FIG. 717 is a list representing the format of a TCH setup acceptanceinformation element without frequency indication.

FIG. 718 is a list representing the format of a TCH setup acceptanceinformation element with frequency indication.

FIG. 719 is a list representing the format of a TCH setup responseinformation element without frequency indication.

FIG. 720 is a list representing the format of a TCH setup responseinformation element without frequency indication.

FIG. 721 is a list representing the format of a TCH setup responseinformation element with frequency indication.

FIG. 722 is a list representing the format of a DHO branch additionresponse information element.

FIG. 723 is a list representing the format of an intra-BS DHO branchaddition response information element.

FIG. 724 is a list representing the format of an ACCH setup responseinformation element.

FIG. 725 is a list representing the format of an intra-BS DHO branchaddition request information element.

FIG. 726 is a list representing the format of an intra-BS DHO branchdeletion request information element.

FIG. 727 is a list representing the format of an intra-BS HHO branchaddition request information element.

FIG. 728 is a list representing the format of an ACCH release requestinformation element.

FIG. 729 is a list representing the format of a frequency replacementsetup request information element without frequency indication.

FIG. 730 is a list representing the format of a frequency replacementsetup request information element with frequency indication.

FIG. 731 is a list representing the format of a setup completionnotification information element.

FIG. 732 is a list representing the format of an intra-BS HHO branchdeletion response information element.

FIG. 733 is a list representing the format of an intra-BS HHO branchaddition response information element.

FIG. 734 is a list representing the format of an ACCH release responseinformation element.

FIG. 735 is a list representing the format of a frequency-indicatedfrequency replacement setup response information element.

FIG. 736 is a list representing the format of a frequency-indicatedfrequency replacement setup request information element.

FIG. 737 is a list representing the format of a frequency-non-indicatedfrequency replacement setup acceptance information element.

FIG. 738 is a list representing the format of a frequency-non-indicatedfrequency replacement setup response information element.

FIG. 739 is a list representing the format of a code replacement requestinformation element.

FIG. 740 is a list representing the format of a TCH release requestinformation element.

FIG. 741 is a list representing the format of an SDCCH release requestinformation element.

FIG. 742 is a list representing the format of a cause informationelement.

FIG. 743 is a list representing the format of an SDCCH setup requestinformation element.

FIG. 744 is a list representing the format of an LAI setup requestinformation element.

FIG. 745 is a list representing the format of a protocol discriminatorof a BC entity message.

FIG. 746 is a list representing the format of a message type identifierof a BC entity message.

FIG. 747 is a list representing the format of a protocol discriminatorof a BSM entity message.

FIG. 748 is a list representing the format of a message type identifierof a BSM entity message.

FIG. 749 is a list representing the format of a number type parameterindicating the type of number which is included at octet 4 and lateroctets in the paged MS ID shown in FIG. 252.

FIG. 750 is a list representing the format of a number length parameterindicating the length of number which is included at octet 4 and lateroctets in the paged MS ID shown in FIG. 252.

FIG. 751 is a block diagram showing a part of the mobile communicationssystem in which a signal is ciphered and successfully received.

FIG. 752 is a block diagram similar to FIG. 751, but the ciphered signalis not successfully received.

FIG. 753 is a block diagram showing a part of the mobile communicationssystem for the description of an encipherment procedure.

FIG. 754 is a block diagram representing the operation of theencipherment procedure in the invented system.

FIG. 755 is a ciphering procedure sequence diagram in normal operationwhere the network and the mobile station commence to enciphertransmitted signals and to decipher received signals after transmissionof an enciphering onset request from the network to the mobile station.

FIG. 756 is a sequence diagram representing a disadvantage of theciphering procedure sequence represented in FIG. 755.

FIG. 757 is a ciphering procedure sequence diagram in normal operationaccording to a control method described in section 3.1.

FIG. 758 is a sequence diagram representing an advantage of theciphering procedure sequence according to a control method described insection 3.1.

FIG. 759 is a schematic sequence diagram representing an enciphermentmethod in a mobile communications system, in which only a specificencipherment manner is adopted.

FIG. 760 represents a schematic sequence diagram representing aselection of encipherment manner by negotiation between mobile stationand network in accordance with a control method described in section3.2.

FIGS. 761 and 762 constitute a detailed sequence diagram representingthe control method described in section 3.2.

FIG. 763 is a diagram representing a conventional method forestablishing access link for a mobile station when the mobile stationlocates at a position where intra-cell diversity handover can be carriedout.

FIG. 764 is a diagram representing a conventional method forestablishing access link for a mobile station when the mobile stationlocates at a position where inter-cell diversity handover can be carriedout.

FIG. 765 is a sequential flow diagram representing a series ofinformation flows transported between the mobile station and the networkfor carrying out the access link setup procedure.

FIG. 766 is a sequential flow diagram representing a series ofinformation flows transported between the mobile station and the networkfor entering the intra-cell diversity handover procedure.

FIG. 767 is a sequential flow diagram representing a series ofinformation flows transported between the mobile station and the networkfor entering the intra-cell diversity handover procedure.

FIG. 768 is a diagram representing features of the invented system forstarting diversity handover simultaneously with the access link setup.

FIG. 769 is a sequential flow diagram representing the start ofintra-cell diversity handover simultaneously with the access link setup.

FIG. 770 is a sequential flow diagram representing the start ofinter-cell diversity handover simultaneously with the access link setup.

FIG. 771 is a diagram representing a situation where transition todiversity handover is necessary immediately after the completion ofbranch replacement.

FIG. 772 is a sequential flow diagram representing a series ofinformation flows transported between the mobile station and the networkfor carrying out the branch replacement.

FIG. 773 is a sequential flow diagram representing an operation in theinvented system which is carried out when the mobile station moves to adiversity handover zone.

FIG. 774 is a diagram representing an embodying method for controllingbranch structure and frequency band in the system according to thepresented invention when a call attempt occurs to or from a mobilestation that can treats a plurality of calls simultaneously and istreating a call.

FIG. 775 is a sequential flow diagram representing the operationexemplified in FIG. 774 of the system.

FIG. 776 is a diagram representing another embodying method forcontrolling branch structure and frequency band in the system accordingto the presented invention when a call attempt occurs to or from amobile station that can treats a plurality of calls simultaneously andis treating a call.

FIG. 777 is a diagram representing another embodying method forcontrolling branch structure and frequency band in the system accordingto the presented invention when a call attempt occurs to or from amobile station that can treats a plurality of calls simultaneously andis treating a call.

FIG. 778 is a sequential flow diagram representing the operationexemplified in FIG. 776 of the system.

FIG. 779 is a sequential flow diagram representing the operationexemplified in FIG. 777 of the system.

FIG. 780 is a diagram representing a control method executed in thesystem according to the present invention when a trigger of handoveroccurs to the mobile station which is treating a plurality of calls.

FIG. 781 is a diagram representing another control method executed inthe system according to the present invention when a trigger of handoveroccurs to the mobile station which is treating a plurality of calls.

FIG. 782 is a sequential flow diagram representing the operationexemplified in FIG. 780 of the system.

FIG. 783 is a sequential flow diagram representing the operationexemplified in FIG. 781 of the system.

FIG. 784 is a diagram representing another control method executed inthe system according to the present invention when a trigger of handoveroccurs to the mobile station which is treating a plurality of calls.

FIG. 785 is a sequential flow diagram representing the operationexemplified in FIG. 784 of the system.

FIG. 786 is a sequential flow diagram representing an operation for thestart of inter-cell diversity handover simultaneously with the accesslink setup.

FIG. 787 is a flowchart of an operation of the mobile station, which isappropriate to realizing the operation in FIG. 786.

FIG. 788 is a sequential flow diagram representing a conventionaloperation for access link setup for a mobile station when the mobilestation is located at the position where it can carry out intra-celldiversity handover.

FIG. 789 is a flowchart of an operation of the mobile station forrealizing the operation in FIG. 786.

FIG. 790 is a diagram showing a part of the invented system fordescribing the ACCH replacement.

FIG. 791 is a sequential diagram representing an alteration of the ACCHreplacement procedure, similar to that shown in FIGS. 53 and 54, but isnot accompany with the replacement of wired access link.

FIG. 792 is a diagram for describing the uplink transmission powercontrol for the mobile stations in the invented system.

FIGS. 793 and 794 are diagrams representing a method for reassigningcode resources in section 3.10.

BEST MODE FOR CARRYING OUT INVENTION

1. General Description of System

1.1. Introduction

This system is a mobile communications system wherein W-CDMA (wide-bandcode division multiple access) is adopted for the radio access manner inorder to enhance efficiency for frequency utilization, to processmultiplexed and high-rate signals flexibly, and to improve thecommunication quality to the level equivalent to fixed networks.

1.2 Entire System Structure

First, with reference to FIG. 1, the entire structure of a W-CDMA mobilecommunications system in accordance with an embodiment of the presentinvention will be described. As shown in FIG. 1, the system comprisesmobile stations MS and a radio base station system BSS. The base stationsystem BSS is constituted of base transceiver systems BTS and a mobilecommunications control center MCC connected to the base transceiversystems via cable transmission lines HW. The mobile stations MS includea wide-purpose mobile station, a small portable mobile station 2connected to a personal computer, a small portable mobile station 3 thatis a traditional portable telephones, and so on. The mobilecommunications control center MCC is connected with the personalcomputers via a fixed PSTN or ISDN, telephone network, or LAN. With sucha structure, high-quality voice data, N-ISDN, packets or modem signalsmay be transformed.

1.3 Abbreviations

Glossary of the abbreviations used in the present specification isindicated in FIG. 265. In addition, the technical terms, which are usedin the present specification but not defined, comply with ITU-TRecommendation Q.65.

2. Access Interfaces

2.1 General Description of Access Interfaces

Chapter 2 prescribes access interfaces of W-CDMA mobile communicationssystem. The access interfaces in this system include, as shown in FIG.2, a radio interface served for communication between the mobile stationMS and the base transceiver systems BTS, and a BTS-MCC interface servedfor communication between the base transceiver systems BTS and themobile communications control center MCC. Although this specificationdescribes the W-CDMA mobile communications system to enable any personskilled in the art to make or use the present invention, the presentinvention is not intended to be limited to the described W-CDMA mobilecommunications system, but is intended to cover any mobilecommunications system according to any kind of access manner within theattached claims.

To prescribe the interfaces, this chapter includes the following items:

1) Services Provided by the System and the System Capabilities inCompliance with the Protocols

2) System Functional Structure and Control Manners for Realizing theServices and System Capabilities

3) Rules for Reference Model Structure and Interfaces in Compliance withthe Protocols

4) Physical Architecture and Physical Condition of the Radio Interface

5) Signal Transfer Protocol for the Radio Interface (Layer-2)

6) Control Protocol for the Radio Interface (Layer-3)

7) Physical Architecture and Electrical Condition of the BS-MCCInterface

8) Information Transmission Protocol for the BS-MCC Interface (ATM Layerand AAL type-2)

9) Signal Transfer Protocol for the BS-MCC Interface (AAL)

10) Control Protocol for the BS-MCC Interface (Layer-3)

The control manners and protocol specifications described in thischapter comply with recommendation drafts Q.FNA, Q.FIF, Q.FSA, and Q.FSRprepared on the basis of the discussions at TTC IMT-2000 StudyCommittee, Network Aspect ad hoc.

2.2 Features of Access Interfaces

Next, features of access interfaces will be described.

2.2.1 Handover

A plurality of radio zones are arranged in a mobile communicationssystem and each zone is provided with a base station. To startcommunication between one of the base stations and a mobile station, akind of wireless channel called a perch channel is employed. Morespecifically, a plurality of perch channels of which the frequency bandsare different from each other are established between the base stationand the mobile station for selecting one of traffic channels for actualcommunication. That is to say, the traffic channel TCH for transportingvoice or messages is selected by virtue of the perch channels.

When a mobile station MS travels across the boundary of radio zones,lowered is the level of the electric field of the radio wave receivedfrom the base station of the zone from which the mobile station hasexited, thereby depreciating the communication quality. Accordingly, itis necessary for the mobile station to alter the currently communicatingbase station to a new base station from which the reception is moreexcellent, so that the traffic channel TCH employed by the mobilestation MS is replaced. This replacement is called handover.

In order to facilitate handover, it is preferable that the frequencyband of the former traffic channel TCH and that of the new trafficchannel TCH are the same with each other. In accordance with traditionalmobile communications, a mobile station MS measures the respectivelevels of the electric fields of in relation to circumferential perchchannels and selects candidate base stations for handover. The mobilestation then informs the network of a handover request designating thecandidate base stations for handover.

However, if the traffic channel TCH of the same frequency band as thatof the currently communicating channel is not preselected for candidatecells in circumferential zones, it is impossible that the cells servethe mobile station although the mobile station has transmitted thehandover request. Therefore, it is necessary for the network to exclude,from the candidate cells, the cell without preselection of trafficchannel TCH of the same frequency band as that of the currentlycommunicating traffic channel in accordance with the prior art.

Accordingly, in the present system, the mobile station MS sends thenetwork a handover request wherein previously excluded is the cell thatdoes not preselect the traffic channel TCH at the same frequency band asthe current communication. Next, this feature will be described withreference to FIG. 259 in more detail.

FIG. 259 represents an example of handover procedure in the presentcommunications system. In FIG. 259, a mobile station MS is communicatingat a frequency band f2 in a zone 1. Assume the mobile station MS travelsfrom zone 1 to zone 2; and strength ranking of the reception level(level of the electric field of the received wave) measured by themobile station MS at the frequency band f2 is zone 2, zone 3, and zone4. In this case, the traditional handover request designates that theprimary candidate zone is zone 2, the secondary candidate is zone 3, andthe third candidate is zone 4.

On the contrary, according to the present communications system,broadcasting information indicating the preselection condition of thetraffic channels TCH with reference to the respective circumferentialzones is informed to the mobile station MS as will be described atsection 2.5.2.4.2.6. Using the broadcasting information, the mobilestation recognizes the zone in which the traffic channel TCH at the samefrequency band as the current communication is not preselected, so as toexclude the recognized zone from the handover candidates. Therefore, themobile station MS in the embodiment informs the network of the handoverrequest designating that the primary candidate zone is zone 3 and thesecondary candidate is zone 4.

As will be described in section 2.3.2.2.4, the present communicationssystem can carry out a handover branch addition, handover branchdeletion, and branch replacement handover. The above-discussed procedurein view of the preselection status of traffic channel may be carried outat the handover branch addition and the branch replacement handover.

With reference to FIG. 37, description will be given with respect to anexample of sequential operation wherein the mobile station MS completesto request handover. In FIG. 37, MRRC, MRTR, RFTR, and RRC designatefunctional entities arranged in the mobile station MS. MRRC controls theradio resources. MRTR controls an encipherment procedure and outputtingprocedure and measures the radio environment, that is, the respectivereception levels in relation to the circumferential radio zones. RFTRcontrols an encipherment procedure and outputting procedure. RRCcontrols the radio resources.

As shown in FIG. 37, MRRC provides a CELL CONDITION MEASUREMENT requestindication indicating a request for measurement of the wirelessenvironment to MRTR at periodic intervals. Upon the reception of it,MRTR measures the respective reception levels in relation to thecircumferential radio zones and transmits MRRC the measurement result asa CELL CONDITION MEASUREMENT response confirmation. Next, MRRC comparesthe reception level of the currently communicating wireless channel withthe reception levels of the wireless channels from the circumferentialzones. If the latter is stronger than the former, MRRC conducts thefollowing process to execute handover.

MRRC excludes the zone to which the traffic channel is not preselectedon the basis of the broadcast information, and ranks the zones instrength order with reference to the same frequency band as the currentcommunication. Then, MRRC rearranges the remaining zones in order ofstrength rank, the remaining zones being the candidates for handover;generates a NON-SOFT HANDOVER EXECUTION TRIGGER request indicationdesignating the strength order of the remaining zones; and sends theNON-SOFT HANDOVER EXECUTION TRIGGER request indication to TACF in thenetwork via RRC.

The notification of non-soft handover execution trigger requirement toTACF triggers the handover. Then, the network selects the base stationamong the candidate base stations in order to execute the handover andnotifies the mobile station MS about the selected base station, therebyactivating the traffic channel in relation to the base station.Accordingly, it is possible for the network to exclude complicatedcontrol procedures, e.g., detection procedure of the frequency band thatthe mobile station MS uses for communication and determination procedureas to whether the traffic channel TCH of the same frequency band ispreselected by the candidate zone or not. Subsequent operation followingthe handover trigger is illustrated in FIG. 49.

2.2.2 Replacement of ACCH

Associated control channel (ACCH) is a kind of control channel utilizingthe same radio resources as those for the traffic channel TCH that isused for voice or data transportation. By means of ACCH, control signalsmay be transported between the mobile station MS and base station BS.

There is a kind of communications system wherein one mobile station MScan treat a plurality of calls simultaneously. In addition, there isanother kind of communications system wherein one mobile station MSrealizes a call using a plurality of radio physical channels. Thesesystems are suitable for radio bearer services. In these kinds ofsystems, sometimes it is necessary that control signals may betransported between the mobile station MS, which is treating theplurality of calls, and base station BS.

For this purpose, it would be possible to form ACCHs corresponding toall of the plurality of calls for transporting control signals, ACCHsbeing constituted of wireless communication resources which are alsoutilized by the traffic channels. However, this technique needs manyhardware elements for transporting control signals and complicatedcontrol procedures for managing the transportation order of controlsignals in the plurality of ACCHs.

Accordingly, in the present communications system, when the mobilestation treats a plurality of calls using a plurality sets of wirelesscommunication resources which are also being utilized by a plurality oftraffic channels, one set of the wireless communication resources isselected and then the control channel, which uses this set, isestablished between the mobile station and the base station fortransporting the control information therebetween.

The method for establishing ACCH in the communications system will bedescribed next in more detail.

FIG. 260 illustrates an example of mobile communications system whereina mobile station treats a plurality of calls. In FIG. 260, trafficchannels respectively corresponding to the plurality of calls areestablished between a mobile station MS and a base station BS, wherebythe calls can be treated simultaneously. For treating the multiplecalls, only one ACCH (e.g., ACCH1 in FIG. 260) is selected from themultiple ACCHs corresponding to multiple traffic channels, and sharedfor transporting all control signals in relation to the mobile stationin the system.

Therefore, by virtue of the system, it is possible to reduce the numberof hardware elements for transporting control signals in comparison withthe case that all of the plurality of calls respectively utilizemultiple ACCHs, corresponding to the multiple traffic channels. Inaddition, it is possible to exclude complicated control procedures,e.g., management of the transportation order of control information inthe plurality of ACCHs.

In the system shown in FIG. 260, however, when a set of wirelesscommunication resources involved in the single ACCH is released due tothe release of one of the traffic channels by the ending of the call, itis difficult to secure the ACCH to continue the other call. The sameproblem may occur when the transmission rate in the ACCH is altered.

Accordingly, in addition to sharing the single ACCH by the multipletraffic channels for realizing the multiple calls simultaneously by thesingle mobile station MS, when the single set of wireless communicationresources involved in the single ACCH is released, the ACCH is replacedby another ACCH. FIG. 261 illustrates functional entities to realize theACCH replacement of the system. In this illustration, the mobile stationMS treats two calls, namely first call and second call, simultaneously,the first and second calls utilizing the traffic channel TCH1 or TCH2respectively. However, only one associated control channel ACCH1 isserved for transporting control information between the network and themobile station MS in an initial state.

As shown in FIG. 261, the mobile station MS includes functional entitiescalled TACAF, BCAF1, and BCAF2. TACAF controls the access and instructsto release and establish the ACCHs. BCAF1 controls the radio bearer forthe first call while BCAF2 controls the radio bearer for the secondcall. BACF1 and BACF2 execute to release and establish the correspondingACCHs, respectively.

The base station BS includes functional entities called BCFr1 and BCFr2while the network includes a functional entity called TACF whichfunctions as a base station controller (BSC). BCFr1 and BCFr2respectively control the radio bearers for the first and second callsand execute to activate and release the corresponding ACCHs. TACFcontrols the access and instructs to activate and release the ACCHs.

Assume that the second call utilizing the traffic channel TCH2 should becontinued while the first call utilizing the traffic channel TCH1 isended. The ACCH replacement procedure will be described in thesequential diagram in FIG. 262.

In the procedure, first, once the first call utilizing the trafficchannel TCH1 is ended, the traffic channel TCH1 is released. Once TACFdetects the release trigger of the traffic channel TCH1, TACF determineswhether ACCH1 on the same physical channel as the traffic channel TCH1is used or not. In addition, TACF determines whether an ACCH isnecessary for continuing the traffic channel TCH2 although the trafficchannel TCH1 is released.

If those determinations are affirmative, TACF sends BCFr2, which is incharge of the second call, an activation request for ACCH2 that isaccompanying with the traffic channel TCH2. In response, BCFr2 activatesACCH2. Then, BCFr2 sends a completion report indicating the completionof the activation of ACCH2 to TACF.

Upon the completion report, TACF informs TACAF of a replacement requestfor switching to ACCH2. The reception of the replacement request causesTACAF to inform BACF2 of an establishment request for ACCH2, so thatBCAF2 establishes ACCH2. Additionally, TACF informs BCAF1 of a releaserequirement for ACCH1, so that BCAF1 releases ACCH1.

Next, TACAF sends TACF a replacement completion report indicating thecompletion of the replacement of ACCH. Then, TACF informs BCFr1 of arequest for releasing ACCH1, so that BCFr1 releases ACCH. Consequently,the ACCH replacement is completed, so that transportation of controlinformation between the mobile station and the network may beaccomplished via ACCH2, which uses the same radio resources as thetraffic channel TCH2. The ACCH replacement procedure will be describedagain in more detail at section 2.4.3.5.7.

2.2.3 Procedures for Encipherment Onset Moment Notification

Since mobile communications are carried out over the air, signals aresometimes ciphered (encoded into cipher) at the source terminal to bepreserved from intercept or manipulation by a third party. Thedestination terminal deciphers the ciphered signals (decodes them tomake out the meaning).

However, in communication of the enciphered signals (control signals),if the onset moment of the encipherment is unclear, it is impossible todecipher smoothly. That is, if the onset time of the decipherment may bemisestimated, the meaning of signals cannot be made out.

With reference to FIGS. 751 and 752, a trouble occurring in relation totiming error of encipherment onset and decipherment onset will bedescribed.

FIG. 751 represents a mobile communications system in which anencipherment transfer is conducted. Assume that a mobile station MS canreceive signals using a diversity handover technique. As illustrated inFIG. 751, a base station controller RNC distributes the same series oftransmission signals (non-enciphered signals) to a plurality of radiobase stations BS1 to BS3 for diversity handover of the mobile station.Then, the radio base stations BS1 to BS3 enciphers the series of signalsand transmits the enciphered signals to the single mobile station MS.

In this system, since the respective base stations execute theencipherment processes, there is likelihood that the onset moment of theencipherment varies among the base stations. It is possible in theory toalign the encipherment onset moment among the base stations, butdifficult in practice. More specifically, the base station controllerRNC should negotiate with the radio base stations BS1 to BS3 in advancefor matching the encipherment onset time. However, it is difficult inpractice to prevent the timing error completely.

As described above, it is necessary that the same kind of signal (i.e.,enciphered transmission signal or non-enciphered transmission signal)should be transmitted from all of the base stations BS1 to BS3 forrealizing the diversity combining at the mobile station. However, layer1 of the OSI reference model supervises between the mobile station andthe respective base stations although layer 3 supervises between themobile station MS and the base station controller RNC or between themobile station MS and the mobile service switching center MSC.

Accordingly, as shown in FIG. 752, if the encipherment is conducted forLayer 1 of the OSI reference model, a group of base stations (e.g., BS2and BS3) transmit enciphered signal while another group of the basestations (e.g., BS1) transmit non-enciphered signal at the same time.Therefore, it is impossible for a type of mobile station, which cannotprocess in parallel the enciphered signal and non-enciphered signal inview of structure simplification and production-cost reduction, toconduct diversity combining.

Therefore, it is an object to provide a communications system whereineven a type of mobile station, which cannot process in parallel anenciphered signal and non-enciphered signal, can carry out diversityreception securely. In the system, the mobile station MS and the mobilecommunications control center MCC mutually inform of the enciphermentmoment, so as to appropriately decipher for errorless communication.

With reference to the functional model in FIG. 64, the enciphermentonset moment notification procedures will be described. As shown in FIG.64, the mobile station MS includes functional entities called UIMF, MCF,and TACAF. UIMF stores information on the station user and serves theuser authentication and encipherment calculation. MCF functions as aninterface with the network for realizing services that are not relatedto calls. TACAF controls the access processes to the mobile stationterminal, e.g., the origination, paging, and so on.

The network on the other hand includes functional entities called SACF,TACF, LRCF, and LRDF. SACF is connected with MCF to function as aninterface with the mobile terminal for realizing services that are notrelated to calls. TACF is connected with TACAF to control the accessprocesses to the mobile station terminal, e.g., the origination, paging,and so on. LRCF is connected with TACF and SACF to control mobilitymanagement. LRDF stores various data on mobility management.

With such a structure, prior to the mutual notification of theencipherment onset, a user authentication procedure (refer to section2.4.5.1) is executed as shown in FIG. 63. In execution of the userauthentication procedure, a certificated encipherment key is previouslystored at UIMF and LRDF of the network and mobile terminal and deliveredto TACAF, MCF, TACF, and SACF.

Then, mutual notification of the encipherment onset time is carried outin accordance with the sequence shown in FIG. 65. More specifically,first, LRCF of the network sends a START CIPHERING request indicationfor indicating that the network will start encipherment to TACAF and MCFof the mobile terminal via TACF and SACF of the network. Consequently,the mobile terminal can recognize that the succeeding signalstransmitted from the network will be ciphered. After the transmission ofthe START CIPHERING request indication, TACF and SACF of the networkcipher succeeding signals according to a preselected enciphermentprocedure using a preselected ciphering key. Once the mobile terminalreceives the enciphered signal, TACAF and MCF controls the deciphermentof the received signals. In advance to the decipherment, TACAF and MCFreceive the encipherment key from UIMF to carry out the decipherment.Accordingly, the downlink signal transmitted from the network can betransported in secret and interpreted by only the mobile terminal.

Next, TACAF and MCF of the mobile terminal send a START CIPHERINGresponse confirmation to TACF and SACF of the network, this confirmationindicating that mobile station will next start to transmit encipheredsignals. Consequently, the network entities can recognize that thesucceeding signals transmitted from the mobile terminal will beciphered. After the transmission of the START CIPHERING responseconfirmation, TACAF and MCF of the mobile terminal cipher succeedingsignals according to a preselected encipherment procedure using apreselected ciphering key. Once the terminal entities receive theenciphered signal, TACF and SCF decipher the received signals.Accordingly, the uplink signal transmitted from the mobile terminal canbe transported in secret and interpreted by only the network.

Next, it will be discussed which kind of information should be ciphered.In the invented system, the source device can freely decide theinformation to be ciphered as long as the destination device is notifiedof the ciphered information and communications at layers 1 through 3 areestablished.

It is known that open system interconnection protocols should be adaptedto the open system interconnection reference model illustrated in FIG.263. The OSI model defines the hierarchy consisting of seven functionallayers for managing various functions from physical interconnection toapplication.

The lowest layer, layer 1 is called the physical layer. The physicallayer prescribes mechanical or electrical procedures or means, forexample, configurations of connection plugs.

Layer 2, datalink layer operates to establish, maintain, and release anindividual data link and to detect and recover the error occurring inthe physical layer.

Layer 3, network layer sets up and manages an end-to-end connectionbetween different networks, whereby the upper layers can proceed theirrespective functions without processing for the network type.

Layer 4, transport layer controls the transparent end-to-end datarelaying service between session entities.

Layer 5, session layer establishes or releases the session connection.

The sixth or presentation layer negotiates agreeable technique for dataencoding and punctuation.

The seventh or application layer identifies the communicating source andinstructs the service quality.

The international telecommunication union (ITU) scribes the line circuitinterface at layer 3 that corresponds to layers 3 through 7 in the OSIreference model.

The relationship of the OSI reference model and the present system willbe described in more detail with reference to FIG. 753. FIG. 753 is ageneral view of the present system.

The system illustrated in FIG. 753 includes a mobile station MS, aplurality of radio base stations BS communicable with the mobile stationMS over the air, an base station controller RNC for controlling the basestations BS, and a mobile service switching center MSC for connectingthe base station controller RNC with a fixed network. In addition, thesystem meets the following conditions:

i) Both of the mobile station MS and the base station controller RNC cancarry out diversity reception and distribution.

ii) Layer 1 of the OSI reference model for the radio channel supervisesbetween the mobile station MS and the respective base stations BS.

iii) Layer 2 of the OSI reference model for the radio channel supervisesbetween the mobile station MS and the base station controller RNC.

iv) Layer 3 of the OSI reference model for the system supervises betweenthe mobile station MS and the base station controller RNC or between themobile station MS and the mobile service switching center MSC.

In addition, Layer 2 should meet the following functional conditions:

i) At the source, it has a function to retransmit layer-2 frames

ii) At the destination, it has a function to reassemble layer-3-framesfrom received layer-2-frames in the regular order even if alayer-3-frame was divided into a plurality of layer-2-frames at thesource.

iii) At the destination, it does not have a function to interpret aciphered signal and non-ciphered signal both corresponding to the sameinformation when it receives them simultaneously.

Under the above-mentioned conditions, assume that layer 2 conducts theencipherment procedure on layer 2. In this case, as shown in FIG. 754,an application in the mobile service switching center MSC sends anencipherment onset indication at step S1. The encipherment onsetindication is transferred from layer 3 to a layer-2-controller at stepS2, to a layer-2-cipherer/decipherer at step S3, and to the mobilestation MS at step S4.

The network application then sends an encipherment onset request to thelayer-2-cipherer/decipherer of the mobile station MS via thelayer-2-cipherer/decipherer of the network at step S5. Afterward, theapplication of the mobile service switching center MSC makes thelayer-2-cipherer/decipherer of the base station controller RNC carry outthe encipherment process, whereby the signal transmitted from thelayer-2-cipherer/decipherer are enciphered.

In the mobile station MS, the encipherment onset indication istransferred from layer-2-cipherer/decipherer to layer-2-controller atstep S6, to layer 3 at step S7, and finally to the application at stepS8. Upon the reception of the encipherment onset indication, theapplication of the mobile station instructs or sets thelayer-2-cipherer/decipherer to decipher the transmitted signal from thenetwork at step S9.

If the second layer conducts the encipherment process under theabove-described conditions, the encipherment is started at the networkbefore the signals are distributed to the radio base stations BS fordiversity handover in the network. Therefore, the mobile stations canreceives the ciphered signals from the respective base stations, therebyachieving diversity handover surely even if it cannot process inparallel an enciphered signal and non-enciphered signal.

However, in this case, it is possible that the application of the mobilestation requests the layer-2-cipherer/decipherer to decipher signals(Step S9) simultaneously with the retransmission request from thelayer-2-controller in the mobile station to the network (Steps S10 toS12). If the network begins to retransmit the requested signals (StepsS13 and S14) before the completion of the decipherment set-up in thelayer-2-cipherer/decipherer, the layer-2-cipherer/decipherer will notdecipher the enciphered signal and transfer it as it is to thelayer-2-controller. In this case, the layer-2-frame sequence number ofthe signals may not be interpreted. This phenomenon is caused from thatalthough layer 2 (datalink layer) detects errors occurring at layer 1(physical layer) referring to CRCs attached to the signal frames andfacilitates the retransmission, layer 2 also provides the enciphermentprocedures.

This results in problems: the first problem is that the retransmittedlayer-2 frames cannot be utilized, and the second problem is that it isimpossible to reassemble layer-3-frames from received layer-2-frames inthe regular order if a layer-3-frame was divided into a plurality oflayer-2-frames at the source.

Accordingly, it is preferable that the mutual notification of theencipherment onset (transmission of START CIPHERING request indicationand START CIPHERING response confirmation) is conducted at the layerwhich is layer 3 or higher rather than layer 2 in the OSI referencemodel. Therefore, in the system, ciphered is only information thatshould be processed only in one or more layers which are the same as orhigher than layer 3 of the OSI reference model although the mutualnotification of the encipherment onset time is conducted at layer 2.

Consequently, although normal reception is not achieved by an erroroccurring in layer 1 (physical layer), the retransmission can be madeout by the error detection and retransmission in layer 2 independentlyof layer 1. The retransmission causes the reception of the non-receivedsignals in the proper order by the destination. Therefore, thedestination can recognize the encipherment onset time at an improvedprecision. However, if the reliability of layers 1 and 2 can beimproved, it is possible to cipher at layer 2.

2.2.4 Reassignment of TMUI

In the system, an IMUI (international mobile user identity) is alreadyassigned to each of the mobile stations. Each mobile station stores thecorresponding IMUI while the network stores a plurality of IMUI of themobile stations. Communication may be carried out using the IMUIs, butthey can be intercepted by a third party since mobile communications maybe achieved by the air interface. This results in that the third partycan communicate using the intercepted IMUI.

Therefore, in the present system, the network assigns another identity,namely, TMUI (temporary mobile user identity) to each of the mobilestations that is communicable with the network and notifies thecorresponding mobile station about TMUI. More specifically, the TMUI isenciphered to be preserved from being intercepted, and then transmittedthrough the air interface to the mobile station.

The assignment of TMUI is conducted at the location registrationprocedure. If the location registration procedure is failed, thelocation registration procedure should be repeated again. Therefore,confusion of TMUI at each mobile station will not occur in theory.However, if a machine storing TMUI in a mobile station or the networkmalfunctions, such confusion of TMUI and IMUI may occur.

In this case, recovery process is needed for correcting the confusion.Therefore, the system adopts the following procedures, which should becarried out by the network and the mobile station MS.

FIG. 264 represents a sequential operation by the network and a mobilestation MS. This operation starts after a call attempt comes into thenetwork from a user terminal other than the mobile station MSillustrated in FIG. 264. Once the network (more exactly, the mobilecommunications control center) receives a call income, the mobilecommunications control center first carries out a paging in a mannerthat TMUI of the incoming call destination is specified, as shown inFIG. 264. This paging process is a broadcasting of TMUI to the areas ofwhich the mobile communications control center MCC is in charge.

As mentioned above, TMUI is assigned to each mobile station MScommunicable with the mobile communications control center MCC and eachmobile station MS stores its TMUI. Therefore, once mobile stations MSreceive the broadcast TMUI, each mobile station determines whether thebroadcast TMUI is coincident with the TMUI stored therein. If thedetermination is affirmative, only the corresponding mobile station MSsends a paging response to the mobile communications control center MCCat step S2.

Next, the network checks the authenticity of the user (see section2.3.2.4.1). More specifically, the network generates a necessaryauthentication information (random number) for checking the authenticityof the accessing mobile station MS and transmits it to the mobilestation MS at step S3. Once the mobile station MS receives theauthentication information, the mobile station MS executes an arithmeticoperation based on the authentication information (random number) andtransmits the authentication calculation result as an authenticationresponse at step S4. The authentication calculation uses anauthentication key stored in each mobile station MS previously. Thenetwork stores the authentication keys of the respective users at itsstorage device (e.g., SDI) in a manner that the respectiveauthentication keys are associated with the respective IMUIs and TMUIsfor finding the correlation.

Then, the network reads out the authentication key corresponding to thetemporary mobile user identity used for the paging at step S1. Next, thenetwork executes the authentication calculation on the basis of the readauthentication key and the authentication information (random number)transmitted at step S3, and determines whether or not this calculationresult is coincident with the calculation result by the mobile stationMS at step S5. If the determination is affirmative (the results arecoincident), the mobile station MS is authenticated (the mobile stationbelongs to a proper subscriber and is the proper call destination).Afterward, a normal incoming call acceptance procedure is executed.

However, if the determination is negative (the results are notcoincident), the mobile station MS is not the call destination. Such adiscord is caused from that the replying mobile station MS is fraudfullor TMUI managed by the network and TMUI managed by the propersubscriber's mobile station became discord with each other accidentally.Accordingly, the network checks the authenticity of the mobile stationusing the international mobile user identity.

Specifically, first the network (in fact, the mobile communicationscontrol center) transmits an IMUI transmission request to the mobilestation MS for instructing it to transmit the IMUI at step S6. Inresponse, the mobile station MS notifies the IMUI stored in itself.

The network then generates the random number again as the authenticationinformation and sends it to the mobile station MS. In response, themobile station MS uses the authentication information and theauthentication key stored in itself to execute an authenticationcalculation and sends the authentication calculation result as anauthentication response to the network at step S9.

The network then accesses to the storage device thereof and reads outthe authentication key corresponding to the IMUI obtained at step S7.Next, the network executes the authentication calculation on the basisof the read authentication key and the authentication information(random number) transmitted at step S8, and determines if thiscalculation result is coincident with the calculation result by themobile station MS or not at step S10. If the determination at step S10is negative (the results are not coincident), the mobile station MS iscompletely fraudfull, so that the radio channel between the network andthe mobile station MS is disengaged, thereby finishing the communicationat step S12.

On the contrary, if the determination at step S10 is affirmative (theresults are coincident), the mobile station MS can be considered tobelong to a proper subscriber, but its TMUI was altered accidentally.Thus, the mobile communications control center MCC reassigns TMUI atstep S11. In other words, as long as the mobile station MS belongs to aproper subscriber, it can obtain TMUI again and afterward it cancommunicates with the network by means of the newly assigned TMUIalthough the former TMUI has been changed to null accidentally. However,since the mobile station is not a call destination in fact (although themobile station belongs to a proper subscriber), the radio channelbetween the network and the mobile station is disconnected, so that thecommunication is ended at step S12.

As described above, according to this reassignment of TMUI, althoughTMUI stored in the network and TMUI stored in the mobile station MS isdifferent, the network can recognize that mobile station MS belongs to aproper subscriber as long as the IMUI is correct and can reassign thenew TMUI to the mobile station MS. Therefore, although the former TMUIhas been changed to null accidentally, the mobile station can bereturned quickly to the normal condition in which it can communicatenormally.

Furthermore, when the location of the mobile station is registered orthe mobile station request the call origination as well as the incomingcall acceptance described above, the authentication using the TMUI isconducted. In this case, the reassignment of the TMUI is conducted ifnecessary. In the network, the TMUIs are managed by SDF, which will bedescribed later. SDF can be, for example, arranged in a locationregister for managing various information on subscribers in the network.

2.3 Brief Description of System

Next, the system will be described briefly.

2.3.1 Provided Services

This system can totally provide various information transfers includingvoice transfer and data transfer. This system can also provide onemobile station with a plurality of bearer services at the same time. Forexample, the single mobile station can benefit by two unrestricteddigital bearer services at 64 kbps simultaneously. Furthermore, unlikethe traditionally PDC mobile communications system, the wirecommunication meets the requirements of ATM and the radio communicationmeets the requirements of CDMA, whereby transfer is achieved at improvedquality and improved velocity.

FIG. 266 shows the features of services, which can be provided by thissystem. In addition, the present system can be connected with anothersystem managed in accordance with PSTN, N-ISDN, PLML, B-ISDN, orIMT-2000.

2.3.1.1 Bearer Services

This system can provide the following bearer services.

(1) Circuit Switching Mode

a) Voice Bearer Service at 8 kbps

This bearer service is provided for supporting voice services. Thedigital signals at the Um reference point comply with ITU-Trecommendation G.729. However, the bit transparency is not ensured. Thisbearer service will not be utilized for voice-band data communication.The features of the voice bearer service at 8 kbps are listed in FIG.267.

b) Unrestricted Bearer Service at 64 kbps

This bearer service provides information transfer at 64 kbps, theinformation being not changed between the Um reference points. Thefeatures of the unrestricted bearer service at 64 kbps are listed inFIG. 268.

c) Multiplex-Rate unrestricted Bearer Service at n×64 kbps (n is aNatural Number, e.g., 6)

This bearer service provides information transfer at 384 kbps whereinsubrate information is multiplexed with one another, the subrateinformation being not changed between the Um reference points. Thefeatures of the multiple-rate unrestricted bearer service are listed inFIG. 269.

(2) Packet Switching Mode (should be studied further)

This system can provide bearer services at the packet switching mode inaddition to those at the circuit switching mode.

2.3.1.2 Mobility Service

In order to facilitate the mobility or portability services,international mobile user identity (IMUI) is adopted. IMUI is previouslyassigned to each of the mobile stations for identifying the respectivemobile stations. Each mobile station stores its IMUI while the networkmobile communications control center MCC stores a plurality of IMUIs ofthe mobile stations that are served by the network. When one mobilestation moves to a next radio zone, the IMUI of the mobile station isutilized for the location registration and handover, so as to enable themobile station to communicate irrespectively of its location.

2.3.1.3 Quality Requirements

This system enables error correction coding and retransmissionfunctions. Therefore, the average bit-error rate in the network and theair interface is ensured to be less than 10⁻³ in relation to voicetransfer. In relation to transfer of information, e.g., data or controlinformation other than voice, the average bit-error rate is ensured tobe less than 10⁻⁶.

2.3.2 System Capabilities

2.3.2.1 System Capabilities on Connection Services

2.3.2.1.1 Origination

“Origination” is a series of controlling procedures for setting up theintra-network and network-MS access links necessary for communicatingwith a called terminal and for setting up connection to the calledterminal on the basis of an access of a calling mobile station upon acall attempt by the user of the calling mobile station. “Origination”procedures include an SDCCH control, user identity retrieval, userauthentication, encipherment-onset time notification, establishment ofaccess link, mutual information transfer to and from the calling userterminal, and analysis.

The system comprises the following capabilities for the originationprocedures. First, it is possible to establish an SDCCH (stand-alonededicated control channel) to inform the network of the call attempt bythe mobile station MS. SDCCH will be described later in more detail atthe section entitled “SDCCH Control” of this chapter. Furthermore, inorder to establish the association (terminal association) between themobile station and the network, the system comprises the followingfunctions.

a) The network is notified of the call attempt indicating the temporarymobile user identity (TMUI) of a calling mobile station by the mobilestation, thereby setting up the terminal association. In addition, thenetwork is informed of feature capabilities of the mobile station by themobile station and the information on the capabilities is stored in thenetwork, so that the network controls to allow or reject the anothercall attempt to the mobile station.

b) The network recognizes the calling mobile station, which hasrequested the call attempt, and transfers unique information about thecalling mobile station from a network data base to analyzing functionalentities and control functional entities. If the network cannotrecognize the temporary mobile user identity (TMUI) the calling mobilestation, the network sends an inquiry about the international mobileuser identity (IMUI) to the calling mobile station for recognition.

c) The user authentication of the mobile station is executed asdescribed above. The user authentication will be described in moredetail at the section entitled “User Authentication” of this chapter.

d) In order to preserve signals transmitted through the control channeland the information channel between the mobile station and the networkfrom being intercepted and manipulated by a third party, signals areciphered. The encipherment will be described in more detail at thesection entitled “Encipherment” of this chapter.

e) The mobile station is informed of successes and failures of theabove-mentioned respective procedures.

In addition, the network is informed of the services required by thecalling mobile station after the establishment of the terminalassociation. In addition, the network informs the calling mobile stationof the acceptance of the call attempt after the establishment of theterminal association.

Additionally, a call origination control function is informed of aninstance of the terminal association control function, whereby they areassociating with each other.

The mobile station informs the network of the environmental radiocondition around the mobile station when the calling mobile stationsends the call attempt, whereby the network recognizes the condition.

Upon the reception of the call attempt from the mobile station, the userprofile of the originating terminal is retrieved and analyzed, so thatthe services that can be provided for the originating terminal aredetermined.

On the basis of the analysis of on the call attempt from the mobilestation, appropriate network resources, for instance, voicecoder-decoders, data trunks, and wired channels in the network arecaptured, set up, and activated.

The access link for the traffic channel and the associated controlchannel, which are suitable for the services requested by the callingmobile station, can be established (refer to the section entitled“Access Link Establishment” in this chapter). Once the associatedcontrol channel is established, the SDCCH transferring previously thecontrol signals is released. The release of the SDCCH will be describedin more detail at the section entitled “SDCCH Control” in this chapter.

The called user terminal is requested to communicate with theoriginating user terminal. While the called terminal is requested tocommunicate, the originating user terminal is informed of the calling tothe called user terminal and the response from the called user terminal.

The calling or called mobile terminal, for which the call has beenestablished, can originate another call (additional call). However,since the mobile terminal has been already authenticated, theauthentication process is not carried out for the additional call.

In addition, although a call has been established between terminals,another call requested from a third party may be established.

2.3.2.1.2 Incoming Call Acceptance

“Incoming call acceptance” is a series of controlling procedures whereinthe networks calls a destination user mobile station upon a servicerequest from a calling user terminal, and receives the response from thedestination user mobile station so that access-links within the networkand between the network and the mobile station are established, andconnection between those mobile stations are established for thecommunication between the calling and destination user terminals.“Incoming call acceptance” procedures include paging, SDCCH control,user identity retrieval, user authentication, encipherment-onset timenotification, routing in the network, establishment of access link,mutual information transfer to and from the called user terminal, andanalysis.

The system comprises the following capabilities for the terminationprocedures.

First, the network receives a call attempt from a calling user terminalwhich may be a subscriber terminal of this system or another systemconnected thereto. Then, the network retrieves the profile of the calleduser terminal on the basis of the mobile user identity of the calleduser terminal. Therefore, the network can obtain various informationnecessary for analyzing the services which can be provided for thecalled user terminal, for analyzing the condition of the called userterminal, for determining if paging is necessary or not, for determiningthe areas for the paging, and for establishing the terminal associationbetween the network and the called user terminal. Then, the pagingfunction entity of the network is activated for paging. However, thepaging is not carried out for the additional call.

The called mobile station is called by means of the mobile user identityof this mobile station. The network can recognize the responding mobilestation. Usually, in this procedure, TUMI may be used for the mobileuser identity. If the network detects an abnormality of the TMUI, theIMUI uniquely given to the mobile station is used. The paging proceduremay be realized by the following capabilities.

a) The network recognizes the area or areas where the called mobilestation is paged, and then determines the paging channels used for thepaging. Then, the network distributes a paging signal to intra-networknodes (base terminal systems). In response, each BTS transmits a pagingsignal in its coverage sector for paging the called mobile stationwithin the necessary area.

b) An SDCCH is established in order that the mobile station sends thenetwork a response to the paging. This feature will be described in moredetail at the section entitled “SDCCH” control in this chapter.

c) Once the called mobile station sends the network the response to thepaging, the terminal association between the called mobile station andthe network is activated. In addition, the response signal can beidentified by a paging ID corresponding to the calling signal.Furthermore, the mobile station notifies the network about thecapability of the mobile station. The network stores the information onthe mobile station capability for future reception management of anothernew call attempt to the mobile station.

The mobile station informs the network of the environmental radiocondition around the mobile station when the mobile station responds tothe paging, whereby the network recognizes the condition.

Once the mobile station responds to the paging, the network establishesthe terminal association between the network and the mobile station. Theestablishment of the terminal association is executed as follows:

a) The user authentication of the mobile station is executed asdescribed above. The user authentication will be described in moredetail at the section entitled “User Authentication” of this chapter.

b) In order to preserve signals transmitted through the control channeland the information channel between the mobile station and the networkfrom being intercepted and manipulated by a third party, signals areciphered. The encipherment will be described in more detail at thesection entitled “Encipherment” of this chapter.

c) The mobile station is informed of successes and failures of theabove-mentioned respective procedures.

After the establishment of the terminal association, a routing processis carried out for specifying the route to the intra-network controlnode which has controlled the establishment, and then the intra-networkcontrol node is informed of the setting up of the channels within thenetwork and the services requested by the originating user terminal, soas to activated the incoming call acceptance control function.Additionally, the incoming call acceptance control function is informedof an instance of the terminal association control function, wherebythey are associating with each other.

Upon the call attempt, the user profile of the called terminal isretrieved and analyzed, so that the services that can be provided forthe called terminal are determined.

On the basis of the analysis of on the call attempt, appropriate networkresources, for instance, voice coder-decoders, data trunks, and wiredchannels in the network are captured, activated and set up.

The access link for the traffic channel and the associated controlchannel, which are suitable for the call attempt, can be established aswill be described at the section entitled “Access Link Establishment” inthis chapter. Once the associated control channel is established, theSDCCH transferring previously the control signals is released. Therelease of the SDCCH will be described in more detail at the sectionentitled “SDCCH Control” in this chapter.

The called user terminal is informed of a service request from theoriginating user terminal. While the called terminal is informed of theservice request, the originating user terminal is informed of thecalling to the called user terminal and the response from the calleduser terminal.

Although a call has been established between terminals, another callrequested from a third party may be established.

In addition, the calling or called mobile terminal, for which the callhas been established, can respond to another call (additional call).However, since the mobile terminal has been already authenticated, theauthentication process is not carried out for the additional call.

Furthermore, if a plurality of mobile stations respond to the incomingcall acceptance paging, a new TMUI is, during the terminationprocedures, reassigned to one of the mobile station where the storedTMUI is changed accidentally.

2.3.2.1.3 Call Release

“Call release” is a series of procedures for releasing the link withinthe network and the access link between the mobile terminal and thenetwork used for a call, and releasing the connection between the mobileterminal and the other user terminal. The call release is carried outupon a call release request from the mobile terminal or the other userterminal, or upon a detection of the deterioration of the radiocommunication quality. The call release includes a user disconnectionprocedure (updating the user status data) and a procedure for releasingaccess links.

When releasing the last call for a mobile station, the associationbetween the mobile station and the network is released. This processaccompanies with updating the status data in connection with the mobilestation.

For executing the call release, the system comprises the followingcapabilities.

The network is notified of a call release request from a user terminal,and the user terminal is notified of the acceptance of the releaserequest by the network.

In addition, the network informs the user terminal of a call releaserequest from the other user terminal.

In order to update the user status data when the call release occurs,the user profile is updated.

The access link corresponding to the released call is also released aswill be described in more detail at section 3.2.2.3 entitled “AccessLink Release.”

It is determined as to if the released call is the last call for themobile station or not. If it is the last call, the status data inconnection with the mobile station managed in the network is updated toindicate none call status.

Call can be also released upon an access link release procedure (referto section 3.2.2.3 entitled “Access Link Release”) resulting from thedetection of out of synchronization.

Call can be also released upon a call release request from the mobileterminal.

Call can be also released if the originating mobile station abandons thecall.

2.3.2.2 System Capabilities on Access Link Control

2.3.2.2.1 SDCCH Control

“SDCCH Control” includes a procedure for establishing an SDCCH(stand-alone dedicated control channel) for transporting controlmassages between the mobile station and the network and a wired accesslink for transporting the control messages within the network on thebasis of an access of a mobile station; and a procedure for releasingthe SDCCH and the wired access link within the network when they becomenot necessary. These procedures are carried out for every process, whichneeds the interaction between the mobile station and the network, e.g.,the mobile station call origination process, the mobile station calltermination process, and the mobile station location registration.

In order to execute the SDCCH control, the system comprises thefollowing functions.

The mobile station executes a random access procedure over the RACH(random access channel) and requests the network to establish the SDCCH.In response, the network assigns radio resources (uplink and downlinkcodes) for the SDCCH to the mobile station using a FACH (forward accesschannel). The relationship between the establishment request and theassigned the code resources are determined by a random number (personalidentification or PID) contained in the request message transmitted bythe mobile station.

In addition, the network can select the radio resources (uplink anddownlink short codes) for the SDCCH for each sector from the resourcesmanaging for the sector. Unique uplink and downlink long codes are usedfor each base station. In addition, the phase of long codes used foreach sector in a cell is different from that used for the other sectorsin the same cell. Thus, the mobile station obtains the current downlinklong codes by a cell search process or broadcast information from abroadcasting channel BCCH1 and obtains the current uplink long codes bybroadcast information from the broadcasting channel BCCH1.

The network also establishes a wired access link for transferring thecontrol messages within the network upon the establishment request forthe SDCCH from the mobile station.

It is possible to recognize information on the location of the mobilestation when requesting to establish the wired access link within thenetwork.

It is possible to control the power for transmission through the RACH,FACH, and SDCCH. The control manner will be described at section2.3.2.2.6 in more detail.

The network and mobile station can recognize that the status in whichthe SDCCH is unnecessary since, for instance, a process, e.g., thelocation registration which is not associated with call is ended ortransited to the ACCH. Then, the network and mobile can release theSDCCH respectively.

2.3.2.2.2 Access Link Establishment

“Access link establishment” is a series of procedures for setting up atraffic channel for transferring user information and control channelsfor transferring control information between the network and the mobilestation that originates a call or is called. These procedures includeestablishing wired access link in the network and radio access linkbetween the network and the mobile station.

In order to execute the access link establishment, the system comprisesthe following capabilities.

The network determines information transfer capabilities and qualitylevels needed for the respective connection access links on the basis ofa call/connection control request, and then allocates appropriateresources to the access links.

The mobile station designates candidate sectors, for which the wiredaccess links or radio access links should be established, on the basisof the measurements of the perch channels and the broadcast informationfrom the network. Then, the mobile station informs the network of thecandidate sectors. The call acceptance control procedure will bedescribed in more detail at section 2.3.2.2.7.

The network sets up the wired access link between the network and therespective candidate sectors. Each established wired access linkincludes the traffic channel for transferring user information and, ifnecessary, the control channel for transferring control signals.

The network stores the uplink long codes for radio access links in adatabase within the network according to MS identifiers (TMUI/IMUI). Thenetwork retrieves the information from the database to set up an accesslink.

The network selects radio resources for the radio access link in thespecified sector and allocate them to the mobile station. The radioresource selection will be described in more detail at section2.3.2.2.5.

The mobile station transmits information to the network for determiningthe initial power for transmission through the downlink radio accesslink, the information being based on the measurements on the perchchannel and including information on the power for transmitting throughthe perch channel and the signal-to-interference ratio about the signalreceived from the perch channel.

The network determines the initial power for transmission through thedownlink radio access link upon the reception of the information fromthe mobile station. The control of the transmission power will bedescribed in more detail at section 2.3.2.2.6.

The base station controller receives information on the wired accesslinks and the radio access links and is able to start diversity handoverbased on the information at the same time when the access links areestablished for the candidate base stations, and carries out diversityhandover on the basis of the information on the candidate sectors.Handover procedures will be described in more detail at section2.3.2.2.4.

The mobile station informs the network of the respective phasedifferences upon a broadcast information (periodical broadcasts at theintervals of 20 msec), each phase difference being the differencebetween the uplink long code phase of the sector to which the SDCCH isestablished and the uplink long code phase of another candidate sector.

The network synchronizes the uplink radio access links on the basis ofthe uplink long code phase difference information from the mobilestation.

2.3.2.2.3 Access Link Release

“Access link release” is a series of procedures for releasing alltraffic channels for transferring user information between the networkand the mobile station and all control channels for transferring controlinformation therebetween. “Access link release” procedures include aprocedure for releasing wired access links in the network and radioaccess links between the network and the mobile station.

In order to execute the access link release procedures, the systemcomprises the following capabilities.

Due to release of an individual connection or release of connections fora released call, the network releases the corresponding access link. Therelease of access link is requested from the network to thecorresponding mobile station.

If the network detects out-of-synchronization status in connection withall handover branches involved in an access link and does not detect thesynchronization status again for a certain time period counted by asquelch reservation timer, the network executes to release the accesslink.

If the mobile station detects out-of-synchronization status inconnection with all handover branches involved in an access link, themobile station stops to transmit over radio channels involved in theaccess link and causes the network to recognize that theout-of-synchronization status occurs. It is possible that the mobilestation informs the network of the occurrence of theout-of-synchronization.

When an access link is released during diversity handover, all thehandover branches involved in the access link are also released.

2.3.2.2.4 Handover

“Handover” is a series of procedures for altering the access pointthrough which a mobile station accesses the network while thecommunication therebetween is continued. The handover is necessary forthe reason of travelling of the mobile station and deterioration of thecommunication quality, or in order to distribute traffic. The handoverprocedures include alteration of radio access link and if necessary,alteration of wired access link. In order to execute handover, thesystem comprises the following capabilities.

The system can execute various types of processes for realizing handoveras described below.

a) Inter-Sector Handover Branch Addition in Single Cell

Near the boundary between sectors in a single cell, added is a branchfor a new sector, which is different from the sector currently used, butin the same cell. This addition does not accompany with an addition ofthe wired access link in the network.

b) Inter-Cell Handover Branch Addition

Near the boundary between cells, added is a branch for a new cell, whichis different from the cell used currently. This addition does accompanywith an addition of the wired access link for the newly added cell inthe network.

c) Inter-Sector Handover Branch Deletion in Single Cell

Near the boundary between sectors in a single cell, deleted is one ofhandover branches for the sectors when intra-cell diversity is no longernecessary. This deletion does not accompany with a deletion of the wiredaccess link in the network.

d) Intra-Cell Handover Branch Deletion

Near the boundary between cells, deleted is one of handover branches forthe cells when inter-cell diversity is no longer necessary. Thisdeletion does accompany with a deletion of the wired access link for thenewly deleted cell in the network.

e) Intra-Cell Branch Replacement Handover

At a boundary between sectors in a single cell, all handover branchesare released, and then a new access link is established for the sector,which should be newly served. If the service attributes are notnecessary to be changed for this handover, the wired access link in thenetwork is left.

f) Inter-Cell Branch Replacement Handover

At a boundary between cells, all handover branches are released, andthen a new access link is established for the cell, which should benewly served. If the service attributions are not necessary to bechanged for this handover, the wired access link in the network is left.

g) Intra-Sector Frequency Replacement Handover

For all handover branches being used for communication, the radiofrequency is replaced by another frequency. This handover does notaccompany with an addition or deletion of the wired access link in thenetwork.

h) Code Replacement Handover

For a handover branch being used for communication, the downlink shortcode is replaced by annother downlink short code belonging to the samecode type in the same sector. This handover does not accompany with areplacement of the wired access link in the network.

i) User Data Rate Modification

In order to alter user-to-user connection attributions, e.g., the userdata rate or voice/data type, all handover branches for the connectionis released, and then access links for the altered connection areestablished.

j) ACCH Replacement

Although radio resources used by an ACCH are released for the reasonthat a connection or call is released, it is sometimes necessary tocontinue another call. In this case, the ACCH is handed over to thewired access link and radio access link that has been used for theremaining call.

When control signals are transported through an ACCH corresponding to aconnection, it is sometimes necessary to alter the transmission rate. Inthis case, the ACCH is handed over to the wired access link and radioaccess link that has been used for another connection.

k) Code Type Replacement

“Code type replacement” may be carried out. In this case, for allhandover branches being used for communication, the downlink short codesare replaced by downlink short codes belonging to a different code typein the same sector. This handover does not accompany with a replacementof the wired access link in the network.

By the above-mentioned handover branch addition, the maximum number ofhandover branches availed for all simultaneous connections is “N.”

The mobile station, on the basis of the perch channel measurements andcall acceptance information from the network, requests the network toactivate the handover branch addition, handover branch deletion, andbranch replacement handover. The request information for the activationincludes the information for designating the candidate sectors forhandover. The call acceptance control will be described in more detailat section 2.3.2.2.7.

Upon the reception of the activation request, the network selects thesectors for handover from the candidate sectors.

In the handover branch addition, the network assigns the radio frequencyband, which is the same as of the currently used branch, to the channelfor the additional branch, the radio frequency band being the radioresource. In addition, the network assigns the same uplink coderesources to all of the branches for one connection. The selection ofthe radio resources will be described in more detail at section2.3.2.2.5.

When it is impossible to carry out the handover because of a deficiencyin necessary radio resources or intra-network resources, the networkignores the handover request from the mobile station. If the mobilestation does not receive the handover executing instruction, from thenetwork for a certain time, that should be transmitted upon thereception of the handover request from the same mobile station, themobile station analyzes the necessity of handover again. Then, themobile station requests the network to execute the handover again if itis determined to be necessary.

The mobile station sends the network the information to be used fordetermining the initial transmission power over the downlink access linkof the additional branch. The information is based on the perch channelmeasurements.

Upon the reception of the information for determining the initialtransmission power, the network determines initial transmission powerover the downlink access link of the additional branch. The transmissionpower control will be described in more detail at section 2.3.2.2.6.

In the handover branch addition, based on a broadcast information(periodical report information) at the intervals of 20 msec, the mobilestation informs the network of the phase difference of uplink long codesamong the respective candidate sectors, and the group of frame offsetsand group of slot offsets used in the mobile station.

Upon the reception of notification of the uplink long code phasedifference information and the groups of frame offsets and slot offsets,the network establishes the synchronization of the uplink radio accesslink of the sector corresponding to the added branch.

At the same time for execution of the branch addition, intra-sectorfrequency replacement handover, or user data rate modification, it ispossible to execute the handover branch addition at boundary betweensectors in single cell or at the boundary between cells. By the handoverbranch addition at boundary between sectors in single cell or at theboundary between cells, the maximum number of newly added handoverbranches is N−1.

The handover branch addition and handover branch deletion can beexecuted at the same time. After the execution of the handover branchaddition and handover branch deletion in the combined manner, themaximum number of the branches is “N.”

At the same time for execution of the access link establishment, thehandover branch addition, branch replacement handover for anotherconnection, ACCH replacement, or the code type replacement may beexecuted for another connection.

The network requests the mobile station to replace the short codes inorder to utilize the short code resources efficiently.

At the same time for the releasing access links, the ACCH replacement isalso carried out.

However, handover of the SDCCH is not carried out.

2.3.2.2.5 Radio Resource Selection

“Radio resource selection” is a selection of suitable radio resources,for instance, radio frequency channel, short codes, offsets, on thebasis of information transmitted from the mobile station to executingthe SDCCH establishment, access link establishment, and the proceduresfor handover. For the radio resource selection, the system comprises thefollowing capabilities.

The mobile station informs the network of the radio capabilities, forexample, the available radio frequency channels or available spreadingcodes of the mobile station.

The network retrieves uplink long codes from a database in the network,the uplink long codes being associated with respective mobile stations,so that each mobile station corresponds to unique uplink long codes.

The network manages the states of respective uplink short codes (if theuplink short codes are used by mobile stations or not) for each sectorand selects the uplink short codes for respective connections. Thenetwork also determines to execute or refuse the requested radioresource selection on the basis of the respective uplink interferencelevels of the sectors, requested transmission rate, and requestedquality level.

The network manages the states of respective downlink short codes (thedownlink short codes are used by the respective mobile station or not)and selects the downlink short codes for respective connections inaccordance with a request.

The network selects the group of radio frame offsets and group of slotoffsets during the radio resource selection for the SDCCH establishmentand access link establishment.

2.3.2.2.6 Transmission Power Control

“Transmission power control” includes an initial transmission powerdetermination process for determining the initial transmission power fortransmitting signals through the radio access link at the start ofsignal transmission through the RACH (random access channel) or the FACH(forward access channel), at the SDCCH (stand alone dedicated controlchannel) establishment, at access link establishment, or at proceduresfor handover; and a downlink transmission power control for respectivehandover branches during diversity handover. However, the transmissionpower control does not include the transmission power control executedat layer 1.

(1) Initial Uplink Transmission Power Determination

Power for transmission over the uplink radio channel from the mobilestation to the base station should be minimized as small as possible toreduce the capacity of the uplink radio channel and to prevent otherradio access links from affected. For this purpose, it is preferable toselect the radio zone in which the power can be minimized for signalconveyance when selecting the radio zone whose base station should beready (on standby) for communication with the mobile station immediatelyor will commence communication with the mobile station after handover.Therefore, means for the selection is necessary.

However, traditional mobile stations simply detect respective receptionlevels or respective SIRs (signal-to-interference ratios) of channelsfor the base stations as information used for radio zone selection.Furthermore, the respective transmission power levels vary according tothe base stations sometimes. Therefore, in traditional communicationssystems, it is impossible for each mobile station to optimize the uplinktransmission power from the mobile station itself to the network.

In order to resolve these issues and determine the initial uplinktransmission power optimally, the system comprises the followingcapabilities.

Using the periodical report (information broadcast at the intervals of20 msec) via perch channels, the network broadcasts calibrated perchchannel transmission power levels. The calibrated perch channeltransmission power levels has been calibrated in view of the respectivepath losses at cables and so on within the respective base stations.

Using the periodical report (information broadcast at the intervals of20 msec) via perch channels, the network also broadcasts uplinkinterference levels.

On the basis of the calibrated perch channel transmission power levels,the respective uplink interference levels, the respective perch channelreception power levels measured at the mobile station, and respectivesignal-to-interference ratios involved in reception at the respectivenear base stations, the mobile station can determine the initial uplinktransmission power level. The signal-to-interference ratios as referencedata are previously stored in the mobile station.

With reference to FIG. 792, the initial uplink transmission powerdetermination will be described below.

In FIG. 792, two base stations “A” and “B” transmits the broadcastinformation via the corresponding perch channels. The calibrated perchchannel transmission power levels are Pa and Pb, respectively. Therespective reception levels of the broadcast information at the mobilestation via the perch channels from the base stations are Ra and Rb. Themobile station can calculate the respective path losses on the basis ofthe perch channel transmission power levels Pa and Pb indicated in thebroadcast information and the respective perch channel reception levelsRa and Rb. More specifically, the path loss Lpa from the base station“A” to the mobile station is calculated by the next formula.Lpa=Pa−Ra

The path loss Lpb may be calculated similarly.

On the basis of the calculated respective path losses in relation to thebase stations, the respective uplink interference levels in relation tothe base stations, and respective signal-to-interference ratios involvedin reception at the respective near base stations, the mobile stationcalculates respective necessary uplink transmission power levels betweenthe mobile station and respective near base stations. This calculationis conducted for selecting the radio zone to which a mobile stationshould camp on or should be handed over. More specifically, the mobilestation selects the radio zone in which the necessary uplinktransmission power level is minimum among the respective necessaryuplink transmission power levels, and optimizes (minimizes) the uplinktransmission power in accordance with the selected radio zone (selectedbase station). Accordingly, although the respective transmission powerlevels of the perch channels vary according to the base stations, eachmobile station can optimize the uplink transmission power in theinvented system.

(2) Initial Downlink Transmission Power Determination

1) FACH and Downlink SDCCH

The mobile station sends information via RACH to inform the network(more exactly, BTS) of the signal-to-interference ratio in relation tothe perch channel reception at the mobile station. The BTS determinesthe initial downlink transmission power through the FACH (forward accesschannel) or SDCCH (stand alone dedicated control channel) on the basisof the perch channel signal-to-interference ratio in relation to thereception at the mobile station, the perch channel transmission powerlevel, the required signal-to-interference ratio involved in receptionat the mobile station via the FACH or SDCCH, and a rate-calibrationparameter. The perch channel transmission power level is stored as areference data for the BTS.

2) Downlink TCH

Using a broadcast channel (BCCH1) mapped at the perch channel, thenetwork (more exactly, BTS) broadcasts a perch channel transmissionpower levels, which is not calibrated. Using the SDCCH, the mobilestation informs the network (more specifically, the base stationcontroller function) of the perch channel reception SIR at the mobilestation. Using the SDCCH, the mobile station informs the network (thebase station controller function) of the perch channel transmissionpower level which is not calibrated.

On the basis of the perch channel signal-to-interference ratio inrelation to the reception at the mobile station, the non-calibratedperch channel transmission power level, the requiredsignal-to-interference ratio involved in reception at the mobile stationvia the TCH (traffic channel), and a rate-calibration parameter, the BSCfunction in the network calculates the initial downlink transmissionpower through the TCH. The required SIR involved in reception at themobile station via the TCH is stored as a reference data for the BSCfunction. If there are a plurality of candidate zones from whichselected is the zone to which the traffic channel is established, theBSC function calculates the respective initial downlink transmissionpower levels of the respective zones and selects the minimal powerlevel. The branch for the zone corresponding to the minimal power levelis the main branch.

The BSC function of the network informs the base station of the initialdownlink transmission power level.

The mobile station can execute the low-rate downlink transmission powercontrol according to layer 3 since it is possible that high-ratetransmission power control is not executed ordinarily due to thedeterioration of transportation via a radio branch during diversityhandover.

The mobile station informs the BSC function in the network of thenon-calibrated perch channel transmission power level and the perchchannel reception SIR periodically.

The mobile station increases or decreases the SIR involved in thereception at mobile station, so that the reception quality at the mobilestation maintains a standard quality.

On the basis of the updated values, the network calculates and/ordetermines the transmission power level again.

2.3.2.2.7 Call Acceptance Control

“Call acceptance control” is a series of control procedures wherein theuplink interference level, downlink transmission power, and activatedequipment resources, which can be measured or detected by the basestation, are compared with respective allowable limits; aleeway/restriction (idle/busy) information is produced on the basis ofthe comparison; and a call attempt is allowed or restricted on the basisof the leeway/restriction information at a call origination, incomingcall acceptance, bearer alteration, or handover. The call acceptancecontrol can be conducted at the network and the mobile station.

However, the call acceptance control at the mobile station is an option.If the call acceptance control is conducted at the mobile station, it ispossible to reduce the number of wastable call attempts, establishmentattempts of traffic channels, bearer alteration requests, and handoverrequests. Therefore, the load involved in control procedures in thenetwork can be lessened.

On the other hand, the call acceptance control at the network isinevitable since the network should recognize the number of callacceptances and the congestion status of traffic.

(1) Call Acceptance Control at Mobile Station

In order that the mobile station carries out the call acceptancecontrol, the system comprises the following capabilities.

Using broadcasting channels (BCCH2), the network broadcasts a callacceptance information.

The mobile station refers to the broadcast information, via broadcastingchannels BCCH2 from candidate base stations from which selected is thebase station to which the traffic channel should be established,directly before the commencement of the random access for the first callorigination, transmission of the setup message for the second callorigination, reception of the setup message for call termination,handover trigger transmission, and transmission of the setup message toalter the bearer.

On the basis of the call acceptance information, the mobile stationdetermines to allow or reject the call attempt.

(2) Call Acceptance Control at Network

Upon the reception of a request for activating TCH, the networkdetermines to allow or reject the call attempt on the basis of the callacceptance information.

2.3.2.2.8 Standby Control

“Standby control” is controlling to transit the state, so that themobile station can transmit and receive after the power of mobilestation is turned on or after the mobile station visits from outside toinside of the network. Additionally, a procedure for changing the radiozone to camp on due to the travel of the mobile station is called“standby zone transition control.”

(1) Standby Control

In order to execute the standby control, the system comprises thefollowing capabilities.

Using the periodical report (information broadcast at the intervals of20 msec) via perch channels, the network broadcasts the calibrated perchchannel transmission power levels. The calibrated perch channeltransmission power levels are calibrated in view of the respective pathlosses at cables and so on within the respective base stations.

Referring to the calibrated perch channel transmission power levels inrelation to the zones in which the downlink long codes may be used andthe perch channel reception power levels at the mobile station, themobile station selects the zone having the minimum path loss. Then, themobile station refers to the broadcast information via BCCH1corresponding to the selected zone.

Using a broadcast channel (BCCH1) mapped at the perch channel, thenetwork broadcasts a standby permission level, standby deteriorationlevel, network number, restricted information, and so on.

Referring to the broadcast information via BCCH1, the mobile stationdetermines to allow or reject the standby.

The network, using the broadcast information via BCCH1 at the perchchannel, broadcasts the information on the data format in the controlchannel.

Referring to the broadcast information via BCCH1, the mobile stationdetermines the paging channel to which the mobile station is connected.

Referring to the broadcast information via BCCH1, the mobile stationdetermines the RACH, which the mobile station should use.

The network, using the broadcast information via BCCH1 at the perchchannel, broadcasts the information on the uplink long codes for thecorresponding zone.

Referring to the broadcast information via BCCH1, the mobile stationdetermines the uplink long codes used for the RACH and SDCCH.

(2) Standby Zone Transition Control

In order to execute the standby zone transition control, the systemcomprises the following capabilities.

The network, using the broadcast information via BCCH1 at the perchchannel, broadcasts information on the downlink long codes for thecircumferential zones.

The mobile station retrieves the information on the downlink long codesfor the circumferential zones from the broadcast information via BCCH1,and conducts the zone transition.

2.3.2.3 System Capabilities on Mobility Management

Next, system capabilities on mobility management will be described.

2.3.2.3.1 Terminal Location Registration and Update

For permitting the travel of the mobile terminals, the terminallocations are supervised by the network. Therefore, the terminallocation data is registered when a user terminal is first detected bythe network (when the power of the mobile terminal is turned on or theuser terminal roams to the network from another network). The terminallocation data is automatically updated when the location of a mobileterminal changes in the same network.

In order to execute the terminal location registration and update, thesystem comprises the following capabilities.

The network informs a mobile station of the location information, sothat the mobile stations recognize the location information.

When the mobile station travels in the network, the network recognizesthat the mobile station moves from the location that is managed by thenetwork and requests to update the location information managed in themobile station.

An SDCCH (stand alone dedicated control channel) is established fortransporting the control signals for the location registration betweenthe network and the mobile station (refer to the section entitled “SDCCHControl”).

Terminal authentication is carried out to prevent the network from anaccess by an improper mobile terminal. Insofar as a terminal isauthenticated, the location information on the terminal is updated inthe network.

The network can assign a new TMUI (temporary mobile user identity) to amobile station.

The network starts the authentication with the IMUI of a mobile stationif the mobile station is not authenticated by the TMUI check.

The network notifies the mobile station of the location registrationcompletion.

If the mobile station does not receive the location registration/updatecompletion report, the mobile station triggers the locationregistration/update procedure again.

2.3.2.4 System Capabilities on Security Services

Next, system capabilities on security services will be described.

2.3.2.4.1 User Authentication

“User authentication” is to determine if each mobile user terminalsending a call attempt to the network is proper or not. The userauthentication is carried out when a mobile station originates a firstcall, when a first call is directed to a mobile station, or when thelocation is registered.

In order to execute the user authentication, the system comprises thefollowing capabilities.

When a mobile station accesses the network, the network produces variousinformation (an authentication calculation result and random number)being necessary for the authentication of the mobile station, andrequests the mobile station to execute an authentication calculation.The network produces an encipherment key used in an enciphermentcalculation after the authentication.

The mobile station produces an authentication calculation result basedon the random number sent by the network and informs the network of theresult.

The authentication calculation results made by the network and themobile station are compared with each other.

The network sends an inquiry about the international mobile useridentity (IMUI) to the mobile station if the mobile station has not beenauthenticated at the authentication procedure using the temporary mobileuser identity (TMUI). The network then produces the authenticationinformation and executes the authentication procedure using the IMUI.

If the mobile station is not authenticated even at the authenticationprocedure using the information based on the IMUI, the originationprocedure, the termination procedure, or location registration procedureis stopped.

2.3.2.4.2 Encipherment

“Encipherment” is a series of procedures to cipher control signals oruser signals transported through the SDCCH, ACCH, or TCH for preventingthe signals from being intercepted or edited by a third party. Theencipherment is carried out at the origination procedure, thetermination procedure, or location registration procedure.

In order to execute the encipherment, various information, e.g.,encipherment keys and relevant information for producing theencipherment keys, for ciphering or deciphering control signals or usersignals that should be transported via wireless interfaces are managed.The information is delivered within the network and to the destinationmobile station when the encipherment is conducted.

The delivered information is used for ciphering the signals and theciphered signals are transported via radio interfaces.

The onset time of ciphering and onset time of deciphering are mutuallynotified between the network and the mobile station.

2.3.2.4.3 TMUI Management

TMUI is a temporary terminal identifier or user identifier transportedvia the air interface in order to keep the IMUI a secret and to decreasethe total length of the terminal identifier. The network assigns theTMUIs to the mobile stations communicable with the network and informsthe respective mobile stations of the individual TMUIs. After the TMUIassignment, the network manages each TMUI all the while thecorresponding mobile station exists in the coverage area of the network.The TMUI assignment may be executed at the location registrationprocedure, origination procedure, and termination procedure. However, inthe invented system, the assignments of TMUIs at origination procedureand termination procedure are option.

In order to execute the TMUI management, the system comprises thefollowing capabilities.

When the network accesses a mobile station for the locationregistration, location update, origination (option), or termination(option), the network prepares a TMUI for the mobile station and storesit.

The network informs the mobile station of the TMUI and confirms that themobile station stores the TMUI. When the location is registered, themobile station is informed of information indicating the TMUI and thenode where the TMUI is assigned. However, at the origination ortermination, the mobile station is informed of only the TMUI.

The TMUI is sent from the network to the mobile station via the airinterface after ciphering for preventing the TMUI being interceptedimproperly at the air interface.

In order to prevent double assignment of the TMUIs, the association ofTMUIs and the mobile stations are managed.

2.3.2.5 System Capabilities on System Management

Next, system capabilities on system management will be described.

2.3.2.5.1 Requirement for System Synchronization

“Requirement for system synchronization” is a requirement forsynchronization in the system including the network and a mobile stationin order to perform diversity handover with a minimum buffering delay.In this system, the MSC (MCC) and the serving BTSs operate according tothe standard clock signal at the regular intervals of 640 msec, so thatthe time alignment is established among the MSC (MCC) and the servingBTSs. However, the phase difference among the MSC function and theserving BTSs is allowable insofar as it is equal to or less than 5 msec.In other words, the requirement for system synchronization is the phasedifference within 5 msec.

2.4 Control Manners

Next, control manners will be described.

2.4.1 Functional Network Architecture

FIG. 3 shows the functional network architecture of the system. Thefunctions of the functional entities comply with ITU-T Recommendations.

In FIG. 3, CCAF (call control agent function) in a mobile terminal is aninterface between the user mobile terminal and CCF (call controlfunction) of the network for providing access for users. TACAF (terminalaccess control agent function) in a mobile terminal controls access forthe mobile terminal, e.g., terminal paging detection.

BCAF (bearer control agent function) in the mobile terminal controlsradio bearers for the mobile terminal. BCF (bearer control function)controls bearers. BCFr (bearer control function (radio bearerassociated)) in the network controls radio bearers.

TACF (terminal access control function) in the network controls accessfor the mobile terminal, e.g., terminal paging execution. CCF (callcontrol function) controls call and connection. SCF (service controlfunction) controls services. SDF (service data function) stores variousdata for execution of services.

LRCF (location registration control function) controls the mobilitymanagement. LRDF (location registration data function) stores variousdata for mobility management. SSF (service switching function) is aninterface between the CCF and SCF and detects the trigger for a servicecontrol. SRF (specialized resource function) controls access to aspecial device, e.g., information storing device.

MCF (mobile control function) in the mobile terminal is an interface tothe network for a non-call service. SACF (service access controlfunction) in the network is an interface to the mobile station for anon-call service. MRRC in the mobile station controls radio resources.RRC in the network controls radio resources.

MRTR (mobile radio transmission and reception) in the mobile stationcontrols the encipherment or transmission and so on. RFTR (radiofrequency transmission and reception) in the network controls theencipherment or transmission and so on. UIMF (user identificationmanagement function) stores the information on the mobile users andprovides the user authentication and encipherment. In the followingdescription, the UIMF may be sometimes called UTMF.

FIG. 4 is a diagram showing the functional network architecture of thesystem, in which functional entities are arranged in a communicationcontrol plane and a radio resource control plane. In FIG. 4, functionalentity numbers (FE numbers) are attached to respective functionalentities. The correlation between the FE numbers and the functionalentities are also represented in FIG. 270.

In addition, relationships between functional entities are shown in FIG.4. The designations of the relationships are also stated in thefollowing.

The relationship between FE01 and FE06 (CCAF′-CCF′) is calledRelationship ra.

The relationship between FE02 and FE05 (TACAF-TACF) is calledRelationship rb.

The relationship between FE07 and FE09 (LRCF-SSF) is called Relationshiprc.

The relationship between FE07 and FE08 (LRCF-LRDF) is calledRelationship rd.

The relationship between FE09 and FE10 (SSF-SRF) is called Relationshipre.

The relationship between FE07 and FE10 (LRCF-SRF) is called Relationshiprf.

The relationship between FE05 and FE07 (TACF-LRCF) is calledRelationship rg.

The relationship between FE05 and FE12 (TACF-SACF) is calledRelationship rh.

The relationship between FE05 and FE06 (TACF-CCF′) is calledRelationship ri.

The relationship between FE05 and FE04 (TACF-BCF) is called Relationshiprj.

The relationship between FE05 and FE04a is called relationship rja.

The relationship between FE05 and FE04b is called relationship rjb.

The relationship between FE07 and FE12 (LRCF-SACF) is calledrelationship rk.

The relationship between FE11 and FE12 (MCF-SACF) is called relationshiprl.

The relationship between FE01 and FE02 (CCAF′-TACAF) is calledrelationship rm.

The relationship between FE02 and FE03 (TACAF-BCAF) is calledrelationship rn.

The relationship between FE13 and FE14 (MRRC-MRTR) is calledrelationship ro.

The relationship between FE13 and FE15 (MRRC-RRC) is called relationshiprp.

The relationship between FE15 and FE16 (RRC-RFTR) is called relationshiprq.

The relationship between FE03 and FE04 (BCAF-BCF) is called relationshiprr.

The relationship between FE04 and FE06 (BCF-CCF) is called relationshiprs.

The relationship between FE05 and FE15 (TACF-RRC) is called relationshiprt.

The relationship between FE02 and FE13 (TACAF-MRRC) is calledrelationship ru.

The relationship between FE02 and FE17 (TACAF-TIMF) is calledrelationship rv.

The relationship between FE11 and FE17 (MCF-TIMF) is called relationshiprw.

The relationship between FE01 and FE18 (CCAF′-UIMF) is calledrelationship rx.

The relationship between FE11 and FE18 (MCF-UIMF) is called relationshipry.

The relationship between FE04a and FE04b (BCFr-BCF) is calledrelationship r44.

The relationship between FE06 and FE06 (CCF′-CCF′) is calledrelationship r66.

The relationship between FE07 and FE07 (LRCF-LRCF) is calledrelationship r77.

The relationship between FE05 and FE05 (TACF-TACF) is calledrelationship r55.

The relationship between FE08 and FE08 (LRDF-LRDF) is calledrelationship r88.

The above-described relationships between the functional entities arealso represented in FIG. 271.

2.4.2 Information Flows of Usual Communication Services

2.4.2.1 Origination for Initial Call and Additional Call

a) Functional Model

a-1) Initial Outgoing Call

FIG. 5 shows the functional model of a part of the invented system fordescribing the origination for initial call. Radio bearers are selectedunder the BCFr controlled by the same TACF that received a call setuprequest. According to the radio resource selection scenario, multipleFEs are selected.

a-2) Additional Outgoing Call

FIG. 6 shows the functional model of a part of the invented system fordescribing the origination for additional call. Radio bearers areselected under the BCFr controlled by the same TACF that received a callsetup request. According to the radio resource selection scenario,multiple FEs are selected.

b) Information Flows

b-1) Initial Outgoing Call

FIGS. 7 and 8 form an information flow diagram showing the originationfor initial call.

b-2) Additional Outgoing Call

FIG. 9 is an information flow diagram showing the origination foradditional call.

c) Definitions of Information Flows, Information Elements, andFunctional Entity Actions

The information flow diagrams will be described supplementally in thefollowing and information elements in the flow diagrams will bediscussed and represented in tables.

A TA SETUP request indication is used by CCAF in the case of a mobileterminal call origination to request to set up a mobile terminal accessto the network and the connection between the CCAF and TACAF. FIG. 272represents the detail of the TA SETUP request indication.

Another TA SETUP request indication is sent from TACAF to request theestablishment of the terminal access, i.e., signaling connection betweenTACAF and TACF. FIG. 273 represents the detail of the TA SETUP requestindication. For the user ID in FIG. 273, TMUI should be used to maintainconfidentiality of IMUI. In this case, TMUI assignment source ID shouldnot be included in order to reduce data length.

A TA SETUP PERMISSION request indication is issued by the TACF to informto request the authorization of the mobile terminal access to thenetwork. FIG. 274 represents the detail of the TA SETUP PERMISSIONrequest indication.

A REVERSE LONG CODE RETRIEVAL request indication is used to retrieve areverse (uplink) long code. FIG. 275 represents the detail of theREVERSE LONG CODE RETRIEVAL request indication.

Another REVERSE LONG CODE RETRIEVAL request indication is used toretrieve the reverse long code. FIG. 276 represents the detail of theREVERSE LONG CODE RETRIEVAL request indication.

A REVERSE LONG CODE RETRIEVAL response confirmation is also used toretrieve the reverse long code. FIG. 277 represents the detail of theREVERSE LONG CODE RETRIEVAL response confirmation.

A TERMINAL STATUS UPDATE request indication is used to update theterminal status. FIG. 278 represents the detail of the TERMINAL STATUSUPDATE request indication.

A TERMINAL STATUS UPDATE response confirmation is a response to therequest indication. FIG. 279 represents the detail of the TERMINALSTATUS UPDATE response confirmation.

An ADD-ROUTING INFORMATION request indication is sent to the LRDF to adda routing address to the subscriber's profile. This information flow issent only when the authentic mobile terminal has been found and theabove related information has been obtained. FIG. 280 represents thedetail of the ADD-ROUTING INFORMATION request indication.

An ADD-ROUTING INFORMATION response confirmation is a response to therequest indication. FIG. 281 represents the detail of the ADD-ROUTINGINFORMATION response confirmation.

A TA SETUP PERMISSION response confirmation is issued by the LRCF toinform the TACF that the mobile terminal access to the network isauthorized. FIG. 282 represents the detail of the TA SETUP PERMISSIONresponse confirmation.

A REVERSE LONG CODE RETRIEVAL response confirmation is used to retrievethe reverse long code. FIG. 283 represents the detail of the REVERSELONG CODE RETRIEVAL response confirmation.

A TA SETUP response confirmation is used to notify that the mobileterminal access has been established. FIG. 284 represents the detail ofthe TA SETUP response confirmation.

Another TA SETUP response confirmation is used to confirm that the setupof the terminal access and the connection between the CCAF and TACAFhave been completed. FIG. 285 represents the detail of the TA SETUPresponse confirmation.

A SETUP request indication is used to request the establishment of theconnection. FIG. 286 represents the detail of the SETUP requestindication.

A TACF INSTANCE ID INDICATIONquest indication is used to retrieve thereverse long code. FIG. 287 represents the detail of the TACF INSTANCEID INDICATIONquest indication.

A CELL CONDITION MEASUREMENT request indication is used by MRRC totrigger measurement of cell selection information. This is a requestinginformation flow whose confirmation (CELL CONDITION MEASUREMENT responseconfirmation) provides the result of the measurement. FIG. 288represents the detail of the CELL CONDITION MEASUREMENT requestindication.

A CELL CONDITION MEASUREMENT response confirmation provides the resultof the cell selection information measurement requested by the CELLCONDITION MEASUREMENT request indication. FIG. 289 represents the detailof the CELL CONDITION MEASUREMENT response confirmation.

A CELL CONDITION REPORT request indication is used by the mobileterminal to report the cell selection information. The information isused by the network to select radio channels. This information flow doesnot require any confirmation. FIG. 290 represents the detail of the CELLCONDITION REPORT request indication.

A CALL SETUP PERMISSION request indication is issued by the SSF torequest the authorization of the calling user. FIG. 291 represents thedetail of the CALL SETUP PERMISSION request indication.

A USER PROFILE RETRIEVAL request indication is used to request the userprofile to be retrieved. FIG. 292 represents the detail of the USERPROFILE RETRIEVAL request indication.

A USER PROFILE RETRIEVAL response confirmation is a response to therequest indication. FIG. 293 represents the detail of the USER PROFILERETRIEVAL response confirmation.

A CALL SETUP PERMISSION response confirmation is issued by the LRCF toinform the calling user is authorized. FIG. 294 represents the detail ofthe CALL SETUP PERMISSION response confirmation.

A SETUP request indication is used to request the establishment of aconnection. FIG. 295 represents the detail of the SETUP requestindication.

A PROCEEDING request indication optionally reports that the indicatedconnection set-up is valid and authorized and that further routing andprogressing of the call is proceeding. This information flow does notrequire any confirmation. FIG. 296 represents the detail of thePROCEEDING request indication.

A MEASUREMENT CONDITION NOTIFICATION request indication is transmittedat relationship rt between the TACF and the RRC and is used by thenetwork to indicate conditions, which the mobile terminal measures, andto report the cell selection information. When the mobile terminal is onan idle mode, the network indicates the MEASUREMENT CONDITIONNOTIFICATION request indication periodically. When the mobile terminalis in communication, the network indicates the MEASUREMENT CONDITIONNOTIFICATION request indication at the change of conditions. Thisinformation flow does not require any confirmation. FIG. 297 representsthe detail of the MEASUREMENT CONDITION NOTIFICATION request indication.

Another MEASUREMENT CONDITION NOTIFICATION request indication istransmitted at relationship rp between the MRRC and the RRC and is usedby the network to indicate conditions, which the mobile terminalmeasures, and to report cell selecting information. When the mobileterminal is on an idle mode, the network indicates the MEASUREMENTCONDITION NOTIFICATION request indication periodically. When the mobileterminal is in communication, the network indicates the MEASUREMENTCONDITION NOTIFICATION request indication at the change of conditions.This information flow does not require any confirmation. FIG. 298represents the detail of the MEASUREMENT CONDITION NOTIFICATION requestindication.

A REPORT request indication, at relationship r66 between a CCF′ andanother CCF′, is an information flow that is used to report statusand/or other types of information transported within the network. Thetype of information (e.g. alerting, suspended, hold, and resume) may beindicated. This information flow does not require any confirmation. FIG.299 represents the detail of the REPORT request indication.

Another REPORT request indication, at relationship ra between the CCAF′and the CCF′, is an information flow that is used to report the statusinformation and/or other types of information transported within thenetwork. The type of information (e.g. alerting, suspended, hold, andresume) may be indicated. This information flow does not require anyconfirmation. FIG. 300 represents the detail of the REPORT requestindication.

A SETUP response confirmation at relationship r66 is used to confirmthat the connection has been established. FIG. 301 represents the detailof the SETUP response confirmation.

Another SETUP response confirmation at relationship ra is used toconfirm that the connection has been established. FIG. 302 representsthe detail of the SETUP response confirmation.

2.4.2.2 Termination for Initial Call and Additional Call

a) Functional Model

a-1) Initial Incoming Call

FIG. 10 shows the functional model of a part of the invented system fordescribing the termination for initial call.

a-2) Additional Incoming Call

FIG. 11 shows the functional model of a part of the invented system fordescribing the termination for additional call.

b) Information Flows

b-1) Initial Incoming Call

FIGS. 12 through 14 form an information flow diagram showing thetermination for initial call.

b-2) Additional Incoming Call

FIGS. 15 and 16 form an information flow diagram showing the terminationfor additional call.

c) Definitions of Information Flows, Information Elements, andFunctional Entity Actions

The information flow diagrams will be described supplementally in thefollowing and information elements in the flow diagrams will bediscussed and represented in tables.

A SETUP request indication is used to report the establishment of aconnection. The detail is represented in FIG. 303.

A ROUTING INFORMATION QUERY request indication is used to inquire therouting information. The detail is represented in FIG. 304. Eithercalled user number or roaming number may be used as an identifier of thecalled user. Roaming number is used in this example represented in FIG.304.

A TERMINAL ID RETRIEVAL request indication is used to request the userprofile to be retrieved. The detail is represented in FIG. 305. Theroaming number item in FIG. 305 is used in this information flow tospecify the user whose profile should be retrieved, instead of thecalled user ID. The selection item in FIG. 305 specifies the data whichshould be retrieved. This information element in this information flowspecifies the user ID.

A TERMINAL ID RETRIEVAL response confirmation is a response to theTERMINAL ID RETRIEVAL request indication. The detail is represented inFIG. 306.

A TERMINAL STATUS QUERY request indication is used to inquire theterminal status (e.g. if terminal access is active or not). The detailis represented in FIG. 307. The selection item in FIG. 307 specifies thedata which should be retrieved. This information element in thisinformation flow specifies the user's call status.

A TERMINAL STATUS QUERY response confirmation is a response to theTERMINAL STATUS QUERY request indication. The detail is represented inFIG. 308.

A TERMINAL STATUS UPDATE request indication is used to update theterminal status. The detail is represented in FIG. 309.

A TERMINAL STATUS UPDATE response confirmation is a response to theTERMINAL STATUS UPDATE request indication. The detail is represented inFIG. 310.

A PAGING AREA QUERY request indication is used to inquire the pagingarea where TACF resides when it is observed that the terminal access isnot active. The detail is represented in FIG. 311. The selection itemrepresented in FIG. 311 specifies the data which should be retrieved.This information element in this information flow specifies the pagingarea.

A PAGING AREA QUERY response confirmation is a response to the PAGINGAREA QUERY request indication. The detail is shown in FIG. 312.

A PAGE request indication at relationship rg is used to trigger a TACFof paging. The detail of the PAGE request indication is represented inFIG. 313. Paging relationship ID in FIG. 313 is generated by the LRCFand is used to correlate the request and the response.

A PAGING request indication at relationship rb is used to page a mobileterminal for determining its position in the network and for the routingfor a call. This information flow requires a confirmation. The detail ofthe PAGING request indication is represented in FIG. 314. The paging IDin FIG. 314 is generated by the TACF and used to identify the response.

A PAGING response confirmation is used to respond to the requestindication. The detail is represented in FIG. 315.

A PAGE response confirmation is a response to the request indication andnotifies the LRCF of the paging result. LRCF initiates SLP for the userauthentication of the responding user after receiving this informationflow. The detail is represented in FIG. 316. This information flow isalso used in case of no response wherein if the optional informationelements in FIG. 316 are not read out, it is regarded that the pagingrequest by the network is not responded by any terminals.

A REVERSE LONG CODE RETRIEVAL request indication is used to retrieve areverse (uplink) long code. The detail of the reverse long code atrelationship rg is represented in FIG. 317.

Another REVERSE LONG CODE RETRIEVAL request indication is used toretrieve the reverse long code. The detail of the reverse long code atrelationship rd is represented in FIG. 318.

A REVERSE LONG CODE RETRIEVAL response confirmation is used to retrievethe reverse long code. The detail is represented in FIG. 319.

A CELL CONDITION MEASUREMENT request indication is used by the MRRC totrigger the measurement of cell selecting information. This informationflow requires a confirmation. The confirmation (CELL CONDITIONMEASUREMENT response confirmation) provides the result of themeasurement. The detail of the CELL CONDITION MEASUREMENT requestindication is represented in FIG. 320.

A CELL CONDITION MEASUREMENT response confirmation provides the resultof the cell selection information measurement requested by the CELLCONDITION MEASUREMENT request indication. The detail of the CELLCONDITION MEASUREMENT response confirmation is represented in FIG. 321.

A CELL CONDITION REPORT request indication is used by the mobileterminal to report the cell selection information. The information isused by the network to select radio channels. This information flow doesnot require any confirmation. The detail is represented in FIG. 322.

An ADD-ROUTING INFORMATION request indication is sent to the LRDFp toadd the routing information to the subscriber's profile. Thisinformation flow is only sent when the authentic mobile terminal hasbeen found and the above related information has been obtained. Thedetail is represented in FIG. 323.

An ADD-ROUTING INFORMATION response confirmation is a response to theADD-ROUTING INFORMATION request indication. The detail of theADD-ROUTING INFORMATION response confirmation is represented in FIG.324.

A PAGE AUTHORIZED request indication at relationship rg is used tonotify the TACF of the result of the terminal authentication. The detailis represented in FIG. 325.

A REVERSE LONG CODE RETRIEVAL response confirmation is used to retrievethe reverse long code. The detail is represented in FIG. 326.

A PAGE AUTHORIZED request indication is used to notify the TACF of theresult of the terminal authentication.

A ROUTING INFORMATION QUERY response confirmation is a response to therequest indication. The detail is represented in FIG. 327. The routingaddress item and TACF instance ID item in FIG. 327 are used in this caseto specify the routing information. The routing address item is used forrouting in the visited network.

A SETUP request indication is used to request the establishment of aconnection. The detail is represented in FIG. 328.

A TERMINATION ATTEMPT request indication is used to request the user'sprofile which may be needed to proceed the call process. The detail isrepresented in FIG. 329.

A USER PROFILE RETRIEVAL request indication is used to retrieve thecalled user's profile from the LRDF. The detail is represented in FIG.330.

A USER PROFILE RETRIEVAL response confirmation is a response to therequest indication from the LRCF. The detail is represented in FIG. 331.

A TERMINATION ATTEMPT response confirmation is a response to the requestindication from the SSF. The detail is represented in FIG. 332.

A SETUP request indication is used to request the establishment of aconnection. The detail is represented in FIG. 333.

A PROCEEDING request indication optionally reports that the instructedconnection setup is valid and authenticated and that further routing andprogressing of the call is proceeding. This information flow does notrequire any confirmation. The detail is represented in FIG. 334.

A MEASUREMENT CONDITION NOTIFICATION request indication is used by thenetwork to indicate conditions, which the mobile terminal measures, andto report the cell selection information. When the mobile terminal is onan idle mode, the network indicates the MEASUREMENT CONDITIONNOTIFICATION request indication periodically. When the mobile terminalis in communication, the network indicates the MEASUREMENT CONDITIONNOTIFICATION request indication at the change of conditions. Thisinformation flow does not require any confirmation. The detail of theMEASUREMENT CONDITION NOTIFICATION request indication is represented inFIG. 335.

A REPORT request indication is an information element that is used toreport status and/or other types of information transported in thenetwork. The type of information may be indicated (e.g. alerting,suspended, hold, resume). This information flow does not require anyconfirmation. The detail of the REPORT request indication is representedin FIG. 336.

A SETUP response confirmation is used to confirm that the connection hasbeen established. The detail is represented in FIG. 337.

A CONNECTED request indication is used to acknowledge that a previouslysent SETUP response confirmation has been received and accepted. Thisinformation flow does not require any confirmation. The detail isrepresented in FIG. 338.

2.4.2.3 Call Release

2.4.2.3.1 Disconnection Instructed by User

(a) Functional Model

FIG. 17 shows the functional model of a part of the invented system fordescribing the disconnection instructed by a user.

(b) Information Flows

FIG. 18 is an information flow diagram showing the disconnectioninstructed by a user.

(c) Definitions of Information Flows

A RELEASE request indication is used to release resources associatedwith a call connection, such as call ID or channels. This informationflow requires a confirmation. The detail is represented in FIG. 339.

A RELEASE response confirmation is used to indicate that all resourcespervasively associated with the connection have been released. Thedetail is represented in FIG. 340.

A TA RELEASE request indication is issued by the TACF to inform the SCFthat an attempt of call release has been detected. This information flowis issued when the last call is released and the control relationshipbetween the terminal and the network should be released. The detail isrepresented in FIG. 341.

A TERMINAL-STATUS-MAKE-IDLE request indication is used to idle theterminal call status. The detail is represented in FIG. 342.

A TERMINAL-STATUS-MAKE-IDLE response confirmation is a response to theTERMINAL-STATUS-MAKE-IDLE request indication. The detail of theTERMINAL-STATUS-MAKE-IDLE response confirmation is represented in FIG.343.

A TA RELEASE response confirmation is used for the confirmation to theTA RELEASE-request indication. The detail of the TA RELEASE responseconfirmation is represented in FIG. 344.

2.4.2.3.2 Disconnection Instructed by Network

(a) Functional Model

FIG. 19 shows the functional model of a part of the invented system fordescribing the disconnection instructed by the network.

(b) Information Flows

FIG. 20 is an information flow diagram showing the disconnectioninstructed by the network.

(c) Definitions of Information Flows

The information flow diagram will be described supplementally in thefollowing and information elements in the flow diagram will be discussedand represented in tables.

A RELEASE request indication is used to release resources associatedwith a call connection such as the call reference or channels. Thisinformation flow requires a confirmation. The detail is represented inFIG. 345.

A RELEASE response confirmation is used to indicate that all resourcespreviously associated with the connection have been released. The detailis represented in FIG. 346.

A TA RELEASE request indication is issued by the TACF to inform the LRCFthat an attempt of call release has been detected. This information flowis issued when the last call is released and the control relationshipbetween the terminal and the network should be released. The detail isrepresented in FIG. 347.

A TERMINAL-STATUS-MAKE-IDLE request indication is used to idle theterminal call status. The detail is represented in FIG. 348.

A TERMINAL-STATUS-MAKE-IDLE response confirmation is a response to theTERMINAL-STATUS-MAKE-IDLE request indication. The detail is representedin FIG. 349.

A TA RELEASE response confirmation is used for the response confirmationof the TERMINAL-STATUS-MAKE-IDLE request indication. The detail isrepresented in FIG. 350.

2.4.2.3.3 Abnormal Release

2.4.2.3.3.1 Abnormal Release Caused from Radio Link Failure Detected byMobile Terminal

2.4.2.3.3.1.1 Common Procedure Module Used

A common procedure module used in this release process is the “userdisconnect.”

2.4.2.3.3.1.2 Information Flow Diagram

a) Functional Model

FIG. 21 shows the functional model of a part of the invented system fordescribing the abnormal release caused from a radio link failure(squelch condition) detected by a mobile terminal.

b) Information Flows

FIG. 22 shows an information flow diagram of the abnormal release,executed in the communication control plane, caused from the radio linkfailure detected by the mobile terminal.

c) Definitions of Information Flows and Information Elements

Information flows in FIG. 22 will be described below and informationelements of the flows are represented in tables. The order ofdescription is the same as the order of the flows in FIG. 22.

A RADIO LINK FAILURE request indication is used to notify a radio linkfailure detected by the BCAF or BCFr. In this flow procedure, thisinformation flow is issued by the BCAF. The detail is represented inFIG. 351.

A RELEASE NOTIFICATION request indication is used to indicate that theconnection between the network and the terminal has been released. Theinformation flow does not require any confirmation. The detail isrepresented in FIG. 352.

A RADIO LINK FAILURE request indication is used to notify that the linkfailure has been detected. The detail is represented in FIG. 353.

Another RADIO LINK FAILURE request indication is used to notify that thelink failure has been detected. The detail is represented in FIG. 354.

A RADIO LINK FAILURE response confirmation is a response confirmation ofthe RADIO LINK FAILURE request indication. The detail is represented inFIG. 355.

A RADIO BEARER RELEASE request indication is used to request to releaseradio bearers. This is originated by network. The detail is representedin FIG. 356.

A TA RELEASE request indication is issued by the TACF to request therelease of terminal access. This information flow is issued for only thelast call release.

A BEARER RELEASE request indication is issued by the TACF to the BCF torelease the radio bearer. The detail is represented in FIG. 357.

A BEARER RELEASE response confirmation is a response confirmation of thebearer release request indication. The detail is represented in FIG.358.

Another BEARER RELEASE request indication is sent by the anchor TACF torequest the serving TACF to release the bearer involved in the call thatshould be released. The detail is represented in FIG. 359.

Another BEARER RELEASE request indication is issued by the TACF to BCFto release the radio bearer. The detail is represented in FIG. 360.

Another BEARER RELEASE response confirmation is a response confirmationof the BEARER RELEASE request indication. The detail is represented inFIG. 361.

A BEARER-AND-RADIO-BEARER RELEASE request indication is issued by theTACF to release the bearer-and-radio-bearer. The detail is representedin FIG. 362.

A BEARER-AND-RADIO-BEARER RELEASE response confirmation is used for aconfirmation of the release of the bearer-and-radio-bearer requested bythe BEARER-AND-RADIO-BEARER RELEASE request indication. The detail isrepresented in FIG. 363.

Another BEARER RELEASE response confirmation is a confirmation responseto inform the TACF that the previous request to release the radio bearerhas been completed. The detail is represented in FIG. 364.

A TA RELEASE request indication is issued by the TACF to inform the LRCFthat the attempt of releasing call has detected. The detail isrepresented in FIG. 365.

A TERMINAL-STATUS-MAKE-IDLE request indication is used to request toupdate the user profile. For call release, this information flow is usedto update the user's call status to idle. The detail is represented inFIG. 366.

A TERMINAL-STATUS-MAKE-IDLE response confirmation is a response to theTERMINAL-STATUS-MAKE-IDLE request indication. The detail is representedin FIG. 367.

A TA RELEASE response confirmation is used for a response confirmationof the TA RELEASE request indication. The detail is represented in FIG.368.

2.4.2.3.3.2 Abnormal Release Caused from Radio Link Failure Detected byNetwork

2.4.2.3.3.2.1 Common Procedure Module Used

A common procedure module used in this release process is the “userdisconnect.”

2.4.2.3.3.2.2 Information Flow Diagram

a) Functional Model

FIG. 23 shows the functional model of a part of the invented system fordescribing the abnormal release caused from a radio link failure(squelch condition) detected by the network.

b) Information Flows

FIG. 24 shows an information flow diagram of the abnormal release,executed in the communication control plane, caused from the radio linkfailure detected by the network.

c) Definitions of Information Flows and Information Elements

Information flows in FIG. 24 will be described below and informationelements of the flows are represented in tables. The order ofdescription is the same as the order of the flows in FIG. 24.

A RADIO LINK FAILURE request indication is used to notify that a linkfailure has been detected and reported by either BCFr or BCFa. Thedetail is represented in FIG. 369.

Another RADIO LINK FAILURE request indication is used to notify that thelink failure has been detected. The detail is represented in FIG. 370.

A RADIO LINK FAILURE response confirmation is a confirmation response tothe RADIO LINK FAILURE request indication. The detail is represented inFIG. 371.

A RADIO BEARER RELEASE request indication is used to request to releasethe radio bearer. This is originated by the network. The detail isrepresented in FIG. 372.

A RELEASE NOTIFICATION request indication is used to indicate that theconnection between the network and the terminal has been released. Theinformation flow does not require any confirmation. The detail isrepresented in FIG. 373.

A RADIO BEARER RELEASE response confirmation is a response confirmationof the RADIO BEARER RELEASE request indication. The detail isrepresented in FIG. 374.

A TA RELEASE request indication is issued by the TACF to request therelease of terminal access. This information flow is issued for only thelast call.

A TA RELEASE response confirmation is a response confirmation of the TARELEASE request indication.

A BEARER RELEASE request indication is issued by the TACF to BCF torelease the radio bearer. The detail is represented in FIG. 375.

A BEARER RELEASE response confirmation is a response confirmation of theBEARER RELEASE request indication. The detail is represented in FIG.376.

Another BEARER RELEASE request indication is sent by the anchor TACF torequest the serving TACF to release the radio bearer involved in thecall that should be released. The detail is represented in FIG. 377.

Another BEARER RELEASE request indication is issued by the TACF to BCFto release the radio bearer. The detail is represented in FIG. 378.

A BEARER RELEASE response confirmation is a response confirmation of theBEARER RELEASE request indication. The detail is represented in FIG.379.

A BEARER-AND-RADIO-BEARER RELEASE request indication is issued by theTACF to release the bearer-and-radio-bearer. The detail is representedin FIG. 380.

A BEARER-AND-RADIO-BEARER RELEASE response confirmation is used for aconfirmation of the release of the bearer and radio bearer requested bythe BEARER-AND-RADIO-BEARER RELEASE request indication. The detail isrepresented in FIG. 381.

Another BEARER RELEASE response confirmation is a confirmation responsefor informing the TACF that the previous request to release the radiobearer has been completed. The detail is represented in FIG. 382.

A RADIO BEARER RELEASE request indication is issued to request torelease the radio bearer. The detail is represented in FIG. 383.

Another RADIO BEARER RELEASE response confirmation is used to confirmthe release of radio bearer requested by the RADIO BEARER RELEASErequest indication. The detail is represented in FIG. 384.

A TA RELEASE request indication is issued by the TACF to inform the LRCFthat the attempt of call release has been detected. The detail isrepresented in FIG. 385.

A TERMINAL-STATUS-MAKE-IDLE request indication is used to request toupdate the user profile. For call release, this information flow is usedto update the user's call status to idle. The detail is represented inFIG. 386.

A TERMINAL-STATUS-MAKE-IDLE response confirmation is a response to theTERMINAL-STATUS-MAKE-IDLE request indication. The detail is representedin FIG. 387.

Another TA RELEASE response confirmation is used for confirmation to theTA RELEASE request indication. The detail is represented in FIG. 388.

2.4.2.3.4 User Disconnect

2.4.2.3.4.1 Information Flow Diagram

a) Functional Model

FIG. 25 shows the functional model of a part of the invented system fordescribing the “user disconnect.”

b) Information Flows

FIG. 26 shows an information flow diagram of the “user disconnect.”

c) Definitions of Information Flows and Information Elements

Information flows in FIG. 26 will be described below and informationelements in the flows are represented in tables. The order ofdescription is the same as the order of the flows in FIG. 26.

A CALL DISCONNECT request indication is used to notify the LRCF that a“user disconnect” has been detected. The detail is represented in FIG.389.

A USER-PROFILE-UPDATE request indication is used to request to updatethe user profile. For call release, this information flow is used toindicate the call has been released. The detail is represented in FIG.390.

A USER-PROFILE-UPDATE response confirmation is a response to theUSER-PROFILE-UPDATE response confirmation. The detail is represented inFIG. 391.

A CALL DISCONNECT response confirmation is a response to the requestmade by the CALL DISCONNECT request indication. The detail isrepresented in FIG. 392.

2.4.3 Information Flow Diagrams for Access Link Control

2.4.3.1 SDCCH Setup

First, the SDCCH setup process will be described.

2.4.3.1.1 Common Procedure Modules Used

2.4.3.1.2 Information Flow Diagram

a) Functional Model

FIG. 27 shows the functional model of a part of the invented system fordescribing the SDCCH setup process.

b) Information Flows

FIG. 28 shows an information flow diagram of the SDCCH setup process.

c) Definitions of Information Flows and Information Elements

Information flows in FIG. 28 will be described below and informationelements of the flows are represented in tables. The order ofdescription is the same as the order of the flows in FIG. 28.

A SIGNALING CHANNEL SETUP REQUEST request indication is used by the MCFand TACF to request the network to setup the signaling channels. Thedetail is represented in FIG. 393.

A SIGNALING CHANNEL SETUP request indication is used by the SCMAF torequest to the network to allocate the signaling channels. The detail isrepresented in FIG. 394.

A SIGNALING CHANNEL SETUP response confirmation is used by the SCMF toallocate the radio resources to the signaling channels. The detail isrepresented in FIG. 395.

A SIGNALING CHANNEL SETUP REQUESTED request indication is used toindicate the reception of the signaling channel setup request (initialaccess detection) from the mobile terminal and to request the network tosetup the corresponding signaling channels in the network. The detail isrepresented in FIG. 396.

A SIGNALING CONNECTION SETUP request indication is used by the TACF andSACF to setup the signaling connection among them and the SCMF. Thedetail is represented in FIG. 397.

A SIGNALING CONNECTION SETUP response confirmation is used to report theestablishment of the signaling channels including the physical radiochannel and the intra-network channel. The detail is represented in FIG.398.

A SIGNALING CHANNEL SETUP REQUEST response confirmation is used by theSCMAF to report the setup of the signaling channels to the network. Thedetail is represented in FIG. 399.

2.4.3.2 Bearer Setup

Next, bearer setup procedures for the radio resource selection will bedescribed,

2.4.3.2.1 Common Procedure Modules Used

2.4.3.2.2 Information Flow Diagram

a) Functional Model

Radio resources are selected under a base station which is differentfrom the one that received a call setup request from a mobile terminalwhile the BSs are controlled by different TACFs. The CCF only has therelationship with the TACFa and does not have the relationship with theTACFv. The TACFa controls both bearer selection and bearer setup. Thereare three BCFs: BCF1, BCF2, and BCFr.

FIG. 29 shows the functional model of a part of the invented system fordescribing the bearer setup for the radio resource selection.

b) Information Flows

FIG. 30 shows an information flow diagram of the bearer setup, executedin the communication control plane, for the radio resource selection.

2.4.3.2.2.3 Definitions of Information Flows and Information Elements

Information flows in FIG. 30 will be described below and informationelements of the flows are represented in tables. The order ofdescription is the same as the order of the flows in FIG. 30.

A BEARER SETUP request indication is used to request the establishmentof the access bearer from the CCF to TACF. The detail is represented inFIG. 400. The information elements asterisked in FIG. 400 are containedin the bearer capability element in FIG. 286 sent from the CCAF.

A CHANNEL SELECTION request indication is used by the TACF to request toselect and reserve radio resources which can support the required bearercapability. This interaction occurs when new radio resources arenecessary for call setup and handover.

A CHANNEL SELECTION response confirmation is used to report the reservedradio resources to the TACF, which requested the reservation. The detailis represented in FIG. 401.

A BEARER SETUP request indication is sent from the TACF to BCF torequest the establishment of the access bearer. The detail isrepresented in FIG. 402.

A BEARER SETUP response confirmation is sent to confirm theestablishment of the access bearer and to indicate the bearer ID of thebearer between the BCF and BCF. The detail is represented in FIG. 403.

Another BEARER SETUP request indication is used to request theestablishment of the access bearer from the TACFa to TACFv. The detailis represented in FIG. 404.

Another BEARER SETUP request indication is sent from the TACF to BCF torequest the establishment of the access bearer. The detail isrepresented in FIG. 405.

Another BEARER SETUP response confirmation is sent from the BCF to TACFto request the establishment of the access bearer. The detail isrepresented in FIG. 406.

A BEARER-AND-RADIO-BEARER SETUP request indication is sent from the TACFto BCFr to request the establishment of the radio bearer and the bearerbetween the BCF and BCFr. The detail is represented in FIG. 407.

A RADIO BEARER SETUP PROCEEDING request indication is used by the BCFrto report that the instructed radio bearer setup is valid and theestablishment of the radio bearer is proceeding. This information flowdoes not require any confirmation. The detail is represented in FIG.408.

A RADIO BEARER SETUP REQUEST request indication is issued by the TACF,which controls a new access bearer, to the TACF, which has the signalingconnection, to request to newly assign a radio bearer to the mobileterminal. The detail is represented in FIG. 409.

A RADIO BEARER SETUP request indication is sent from the TACF to TACAFto request the establishment of the radio bearer. The detail isrepresented in FIG. 410.

Another RADIO BEARER SETUP request indication is sent from the TACAF toBCAF to request the establishment of the radio bearer. The detail isrepresented in FIG. 411.

A RADIO BEARER SETUP response confirmation is sent from the BCAF toTACAF to confirm that the establishment of radio bearer has beencompleted. The detail is represented in FIG. 412.

A BEARER-AND-RADIO-BEARER SETUP response confirmation is sent to confirmthat the establishment of radio bearer and bearer between the BCF andBCFr have been completed. The detail is represented in FIG. 413.

A BEARER SETUP response confirmation is used to confirm that theestablishment of access bearer has been completed. The detail isrepresented in FIG. 414.

Another BEARER SETUP response confirmation is used to confirm that theestablishment of access bearer has been completed. The detail isrepresented in FIG. 415.

2.4.3.3 Radio Bearer Release

2.4.3.3.1 Radio Bearer Release for TACF Anchor Approach

2.4.3.3.1.1 Information Flow Diagram

a) Functional Model

FIG. 31 shows the functional model of a part of the invented system fordescribing the radio bearer release.

b) Information Flows

FIG. 32 shows an information flow diagram of the radio bearer release.

2.4.3.3.1.2 Definitions of Information Flows and Information Elements

Information flows in FIG. 32 will be described below and informationelements of the flows are represented in tables. The order ofdescription is the same as the order of the flows in FIG. 32.

A BEARER RELEASE request indication is sent by the anchor CCF to notifythe anchor TACF that the attempt or event of call release has beendetected and that the bearer involved in the call is being released. Thedetail is represented in FIG. 416.

A RADIO BEARER RELEASE request indication is used by the TACFa torequest to release the radio bearer. This is originated by the network.The detail is represented in FIG. 417.

A RADIO BEARER RELEASE response confirmation is a response confirmationof the RADIO BEARER RELEASE request indication. The detail isrepresented in FIG. 418.

A TA RELEASE request indication is issued by the TACFa to request therelease of the terminal access. This information flow is issued only forthe last call release.

A TA RELEASE response confirmation is a response confirmation of the TARELEASE request indication.

A BEARER RELEASE request indication is issued by the TACF to BCF torelease the radio bearer. The detail is represented in FIG. 419.

A BEARER RELEASE response confirmation is a response confirmation of theBEARER RELEASE request indication. The detail is represented in FIG.420.

Another BEARER RELEASE request indication is sent by the TACFa torequest the TACFv to release the bearer involved in the call is beingreleased. The detail is represented in FIG. 421.

Another BEARER RELEASE request indication is issued by the TACF to BCFto release the radio bearer. The detail is represented in FIG. 422.

A BEARER RELEASE response confirmation is a response confirmation of theBEARER RELEASE request indication. The detail is represented in FIG.423.

A BEARER-AND-RADIO-BEARER RELEASE request indication is issued by theTACF to release the bearer and radio bearer. The detail is representedin FIG. 424.

A BEARER-AND-RADIO-BEARER RELEASE response confirmation is used for aconfirmation of the release of the bearer and radio bearer requested bythe BEARER-AND-RADIO-BEARER RELEASE request indication. The detail isrepresented in FIG. 425.

Another BEARER RELEASE response confirmation is a confirmation of theBEARER RELEASE request indication. The detail is represented in FIG.426.

Another BEARER RELEASE response confirmation is a response confirmationto inform the CCF that the previous request to release the radio bearerhas been completed. The detail is represented in FIG. 427.

Another RADIO BEARER RELEASE request indication is issued by the TACAFto request the radio bearer release. The detail is represented in FIG.428.

Another RADIO BEARER RELEASE request indication is used by the BCAF toconfirm the radio bearer release requested by the RADIO BEARER RELEASErequest indication. The detail is represented in FIG. 429.

2.4.3.4 SDCCH Release

Next, SDCCH release procedures will be described.

2.4.3.4.1 Common Procedure Modules Used

2.4.3.4.2 Information Flow Diagram

a) Functional Model

FIG. 33 shows the functional model of a part of the invented system fordescribing the SDCCH release.

b) Information Flows

FIG. 34 shows an information flow diagram of the SDCCH release.

2.4.3.4.3 Definitions of Information Flows and Information Elements

Information flows in FIG. 34 will be described below and informationelements of the flows are represented in tables. The order ofdescription is the same as the order of the flows in FIG. 34.

A SIGNALING CHANNEL RELEASE REQUEST request indication is used by theMCF and TACF to request the release of a signaling channel. The detailis represented in FIG. 430.

A SIGNALING CONNECTION RELEASE request indication is used by the TACFand SACF to request the release of the signaling channel (in both of thenetwork and the radio resources). The detail is represented in FIG. 431.

A SIGNALING CONNECTION RELEASE response confirmation is used to reportthe release of the signaling channel. The detail is represented in FIG.432.

2.4.3.5 Handover

2.4.3.5.0 Handover Process and Relevant Procedure Modules

Process 1: Handover Trigger

Detection of handover triggering.

Process 2: Handover Resource Reservation

Reservation of radio resources for handover.

Process 3: Handover Execution

Preparing at network side, if any.

Request the mobile terminal as indicated by trigger.

Process 4: Handover Completion

Release of unneeded radio bearer and resources.

FIG. 35 shows a flow chart showing handover processes in general. FIG.36 is an information flow diagram showing processes 1 and 2 describedabove.

FIG. 37 is an information flow diagram representing a sequence in whichinformation flows are transported for starting non-soft handoverexecution, the sequence corresponding to process 1 in FIG. 35. FIG. 38is an information flow diagram representing a sequence in whichinformation flows are transported for starting handover branch addition,the sequence corresponding to process 1 in FIG. 35. FIG. 39 is aninformation flow diagram representing a sequence in which informationflows are transported for starting handover branch deletion, thesequence corresponding to process 1 in FIG. 35.

2.4.3.5.1 Inter-Sector Handover Branch Addition in Single Cell

(Handover Controlled by Same BCFr)

2.4.3.5.1.1 Common Procedure Modules

2.4.3.5.1.2 Information Flow Diagram

a) Functional Model

FIG. 40 shows the functional model of a part of the invented system fordescribing the inter-sector handover branch addition in a single cell.

b) Information Flows

FIG. 41 shows an information flow diagram of the inter-sector handoverbranch addition in a single cell, executed in the communication controlplane.

2.4.3.5.1.3 Definitions of Information Flows and Information Elements

Information flows in FIG. 41 will be described below and informationelements of the flows are represented in tables.

A BEARER SETUP request indication is sent from the TACFa to TACFv torequest the setup of an access bearer. The detail is represented in FIG.433. This information flow identifies the bearer between the BCFa andBCFv.

An INTRA-BCFr HANDOVER BRANCH ADDITION request indication is sent fromthe TACF to BCFr to request to setup new physical radio channel(s). Thedetail is represented in FIG. 434.

An INTRA-BCFr HANDOVER BRANCH ADDITION response confirmation is aresponse to the INTRA-BCFr HANDOVER BRANCH ADDITION request indicationand is sent from the BCFr to TACF to indicate the completion of setup ofthe physical radio channel(s). The detail is represented in FIG. 435.

A RADIO BEARER SETUP REQUEST request indication is sent from the visitedTACF, which controls the newly assigned radio bearer, to TACFa torequest to setup the radio bearer between the mobile terminal and BCFrcontrolled by the visited TACF. The detail is represented in FIG. 436.

A HANDOVER BRANCH ADDITION request indication is sent from the TACF toTACAF to notify of the intra-BCFr handover branch addition, and requeststo add a new physical radio channel to an existing physical radiochannel. The detail is represented in FIG. 437. The information elementmarked by *1 in FIG. 437 may be repeated a plurality of times, thenumber of repetition is the same as the number of the handover branchesat the mobile terminal. The information elements marked by *2 in FIG.437 may be repeated a plurality of times, the number of repetition isthe same as the number of the calls related to the TACF.

A HANDOVER BRANCH ADDITION response confirmation is sent from the TACAFto TACF to notify of the reception of the HANDOVER BRANCH ADDITIONrequest indication.

A RADIO BEARER SETUP request indication is sent from the TACAF to BCAFto request to setup a radio bearer. The detail is represented in FIG.438.

A RADIO BEARER SETUP response confirmation is a response to the RADIOBEARER SETUP request indication sent from the BCAF to TACAF to indicatethe completion of the radio bearer setup. The detail is represented inFIG. 439.

2.4.3.5.2 Inter-Cell Handover Branch Addition

2.4.3.5.2.1 Common Procedure Modules

2.4.3.5.2.2 Information Flow Diagram

a) Functional Model

FIG. 42 shows the functional model of a part of the invented system fordescribing the inter-cell handover branch addition.

b) Information Flows

FIG. 43 shows an information flow diagram of the inter-cell handoverbranch addition, executed in the communication control plane.

2.4.3.5.2.3 Definitions of Information Flows and Information Elements

A HANDOVER CONNECTION SETUP request indication is sent from the TACFa toBCFa to notify of a handover initiation and to request to setup anaccess bearer. The detail is represented in FIG. 440. The informationelement marked by *1 in FIG. 440 identifies the bearer between the CCFand BCF.

A HANDOVER CONNECTION SETUP response confirmation is sent from the BCFto TACF to confirm the HANDOVER CONNECTION SETUP request indication. Thedetail is represented in FIG. 441. The asterisked information element inFIG. 441 identifies the bearer between the BCFa and BCFv.

A BEARER SETUP request indication is sent from the TACFa to TACFv tosetup an access bearer. The detail is represented in FIG. 442. Theasterisked information element in FIG. 442 identifies the bearer betweenthe BCFa and BCFv.

Another BEARER SETUP request indication is sent from the TACF to BCF torequest the bearer setup. The detail is represented in FIG. 443. Theasterisked information element in FIG. 443 identifies the bearer betweenthe BCF and CCF.

A BEARER SETUP response confirmation is sent from the BCF to TACF toconfirm the BEARER SETUP request indication. The detail is representedin FIG. 444. The asterisked information element in FIG. 444 identifiesthe bearer between the BCF and BCFr.

A BEARER-AND-RADIO-BEARER SETUP request indication is sent from the TACFto BCFr to request to setup a bearer between the BCF and BCFr and aradio bearer. The detail is represented in FIG. 445.

A BEARER-AND-RADIO-BEARER SETUP response confirmation is a response tothe BEARER-AND-RADIO-BEARER SETUP request indication and is sent fromthe BCFr to TACF to indicate the completion of setting up of the radiobearer and bearer between the BCFr and BCF. The detail is represented inFIG. 446.

A RADIO BEARER SETUP REQUEST request indication is sent from the visitedTACF, which controls the newly assigned radio bearer, to the TACFa torequest to setup the radio bearer between the mobile terminal and BCFr.The detail is represented in FIG. 447.

A HANDOVER BRANCH ADDITION request indication is sent from the TACF toTACAF to notify of the HANDOVER BRANCH ADDITION request indication andto request to setup a new physical radio channel(s) without releasingthe existing physical radio channel(s). The detail is represented inFIG. 448. The information elements marked by *1 in FIG. 448 may berepeated a plurality of times, the number of repetition is the same asthe number of the destination cells. The information elements marked by*2 in FIG. 448 may be repeated a plurality of times, the number ofrepetition is the same as the number of the calls related to the TACF.

A HANDOVER BRANCH ADDITION response confirmation is sent from the TACAFto TACF to notify of the reception of the HANDOVER BRANCH ADDITIONINITIATION request indication.

A RADIO BEARER SETUP request indication is sent from the TACAF to BCAFto request to setup a radio bearer. The detail is represented in FIG.449.

A RADIO BEARER SETUP response confirmation is a response to the RADIOBEARER SETUP request indication and is sent from the BCAF to TACAF toindicate the completion of the radio bearer setup. The detail isrepresented in FIG. 450.

A BEARER SETUP response confirmation is sent from the TACFa to TACFv toconfirm the establishment of the access bearer. The detail isrepresented in FIG. 451.

2.4.3.5.3 Inter-Sector Handover Branch Deletion in Single Cell (HandoverControlled by Same BCFr)

2.4.3.5.3.1 Common Procedure Modules

2.4.3.5.3.2 Information Flow Diagram

a) Functional Model

FIG. 44 shows the functional model of a part of the invented system fordescribing the inter-sector handover branch deletion in a single cell.

b) Information Flows

FIG. 45 shows an information flow diagram of the inter-sector handoverbranch deletion in a single cell, executed in the communication controlplane.

2.4.3.5.3.3 Definitions of Information Flows and Information Elements

A HANDOVER BRANCH DELETION request indication is sent from the TACF toTACAF to request to release the physical radio channel(s). The detail isrepresented in FIG. 452. The information elements marked by *1 in FIG.452 may be repeated a plurality of times, the number of repetition isthe same as the number of the handover branches related to the terminal.The information elements marked by *2 in FIG. 452 may be repeated aplurality of times, the number of repetition is the same as the numberof the calls related to the terminal. The Handover branch ID element inFIG. 452 is used to uniquely identify the route by which an access linkis carried.

A HANDOVER BRANCH DELETION response confirmation is sent from the TACAFto TACF to confirm the HANDOVER BRANCH DELETION request indication. Thedetail is represented in FIG. 453.

A BEARER RELEASE request indication is sent from the TACFa to TACFv torelease the access bearer. The detail is represented in FIG. 454.

An INTRA-BCFr HANDOVER BRANCH DELETION request indication is sent fromthe TACF to BCFr to request the release of the physical radiochannel(s). The detail is represented in FIG. 455. The asteriskedinformation element in FIG. 455 is included when this information flowis sent from BCFr to TACF.

An INTRA-BCFr HANDOVER BRANCH DELETION response confirmation is aresponse to the INTRA-BCFr HANDOVER BRANCH DELETION request indicationand is sent from the BCFr to TACF to indicate the release of thephysical radio channel(s). The detail is represented in FIG. 456.

A BEARER RELEASE response confirmation is sent from the TACFv to TACFato confirm the BEARER RELEASE request indication. The detail isrepresented in FIG. 457.

2.4.3.5.4 Inter-Cell Handover Branch Deletion at Locations Other ThanBoundary Between Cells

2.4.3.5.4.1 Common Procedure Modules

2.4.3.5.4.2 Information Flow Diagram

a) Functional Model

FIG. 46 shows the functional model of a part of the invented system fordescribing the inter-cell handover branch deletion.

b) Information Flows

FIG. 47 shows an information flow diagram of the inter-cell handoverbranch deletion, executed in the communication control plane.

2.4.3.5.4.3 Definitions of Information Flows and Information Elements

Information flows in FIG. 47 will be described below and informationelements of the flows are represented in tables.

A HANDOVER BRANCH DELETION request indication is sent from the TACF toTACAF to request to release the physical radio channel(s). The detail isrepresented in FIG. 458. The information elements marked by *1 in FIG.458 may be repeated a plurality of times, the number of repetition isthe same as the number of the handover branches related to the terminal.The information element marked by *2 in FIG. 458 may be repeated aplurality of times, the number of repetition is the same as the numberof the calls related to the terminal. The handover branch ID element inFIG. 458 is used to uniquely identify the route by which an access radiolink is carried.

A HANDOVER BRANCH DELETION response confirmation is sent from the TACAFto TACF to confirm the HANDOVER BRANCH DELETION request indication. Thedetail is represented in FIG. 459.

A RADIO BEARER RELEASE request indication is sent from the TACAF to BCAFto request the radio bearer release. The detail is represented in FIG.460.

A RADIO BEARER RELEASE response confirmation is a response to the RADIOBEARER RELEASE request indication and is sent from the BCFr to TACAF toindicate the completion of the radio bearer release. The detail isrepresented in FIG. 461.

A HANDOVER CONNECTION RELEASE request indication is sent from the TACFto BCF to release the indicated bearer in the diversity handover state.The detail is represented in FIG. 462.

A HANDOVER CONNECTION RELEASE response confirmation is sent from the BCFto TACF to confirm the HANDOVER CONNECTION RELEASE request indication.The detail is represented in FIG. 463.

A BEARER RELEASE request indication is sent from the TACFa to TACFv torelease the access bearer. The detail is represented in FIG. 464.

Another BEARER RELEASE request indication is sent from the TACF to BCFto request the bearer release. The detail is represented in FIG. 465.

A BEARER RELEASE response confirmation is sent from the BCF to TACF toconfirm the BEARER RELEASE request indication. The detail is representedin FIG. 466.

A BEARER-AND-RADIO-BEARER RELEASE request indication is sent from theTACF to BCFr to request the bearer between the BCF and BCFr and theradio bearer. The detail is represented in FIG. 467. The asteriskedinformation element in FIG. 467 is included when this information flowis sent from BCFr to TACF.

A BEARER-AND-RADIO-BEARER RELEASE response confirmation is a response tothe BEARER-AND-RADIO-BEARER RELEASE request indication and is sent fromthe BCFr to TACF to indicate the completion of the release of the bearerand the radio bearer. The detail is represented in FIG. 468.

A BEARER RELEASE response confirmation is sent from the TACFv to TACFato confirm the BEARER RELEASE request indication. The detail isrepresented in FIG. 469.

2.4.3.5.5 Intra-Cell Branch Replacement Handover

2.4.3.5.5.1 Common Procedure Modules Used

2.4.3.5.5.2 Information Flow Diagram

a) Functional Model

FIG. 48 shows the functional model of a part of the invented system fordescribing the intra-cell branch replacement handover.

b) Information Flows

FIG. 49 shows an information flow diagram of the intra-cell branchreplacement handover executed in the communication control plane.

2.4.3.5.5.3 Definitions of Information Flows and Information Elements

Information flows in FIG. 49 will be described below and informationelements of the flows are represented in tables.

A BEARER SETUP request indication is sent from the TACFa to TACFv tosetup an access bearer. The detail is represented in FIG. 470. Theasterisked information element in FIG. 470 identifies the bearer betweenthe BCFa and BCFv.

An INTRA-BCFr HANDOVER BRANCH REPLACEMENT request indication is sentfrom the TACF to BCFr to request to set up new physical radiochannel(s).

An INTRA-BCFr HANDOVER BRANCH REPLACEMENT response confirmation is aresponse to the INTRA-BCFr HANDOVER BRANCH REPLACEMENT requestindication and is sent from the BCFr to TACF to indicate the completionof the setup of the physical radio channel(s). The detail is representedin FIG. 471. The information element marked by *1 in FIG. 471 may berepeated a plurality of times, the number of repetition is the same asthe number of the radio links to be setup.

An INTRA-BCFr HANDOVER BRANCH REPLACEMENT PROCEEDING request indicationis sent from the BCFr to TACF to indicate that the request of thehandover branch replacement is accepted. The detail is represented inFIG. 472.

A RADIO BEARER SETUP REQUEST request indication is sent from the visitedTACF, which controls the newly assigned radio bearer, to the anchorTACFa to request to setup the radio bearer between the mobile terminaland BCFr controlled by the visited TACF. The detail is represented inFIG. 473.

A NON-SOFT HANDOVER EXECUTION request indication is sent from the TACFto TACAF to notify of a non-soft handover execution request initiationand to request to replace an existing radio channel by the designatedphysical radio channel. The detail is represented in FIG. 474. Theinformation element marked by *1 in FIG. 474 may be repeated a pluralityof times, the number of repetition is the same as the number of thehandover branches related to the terminal. The information elementmarked by *2 in FIG. 474 may be repeated a plurality of times, thenumber of repetition is the same as the number of the calls related tothe TACF.

A RADIO BEARER SETUP request indication is sent from the TACAF to BCAFto request to setup a radio bearer. The detail is represented in FIG.475.

A RADIO BEARER SETUP response confirmation is a response to the RADIOBEARER SETUP request indication and is sent from the BCAF to TACAF toindicate the completion of the radio bearer setup. The detail isrepresented in FIG. 476.

A RADIO BEARER RELEASE request indication is sent from the TACAF to BCAFto request the radio bearer release. The detail is represented in FIG.477.

A RADIO BEARER RELEASE response confirmation is a response to the RADIOBEARER RELEASE request indication and is sent from the BCAF to TACAF toindicate the completion of the radio bearer release. The detail isrepresented in FIG. 478.

A BEARER SETUP response confirmation is sent from the TACFa to TACFv toconfirm the establishment of the access bearer. The detail isrepresented in FIG. 479.

2.4.3.5.6 Inter-Cell Branch Replacement Handover

2.4.3.5.6.1 Common Procedure Modules Used

2.4.3.5.6.2 Information Flow Diagram

a) Functional Model

FIG. 50 shows the functional model of a part of the invented system fordescribing the inter-cell branch replacement handover.

b) Information Flows

FIG. 51 shows an information flow diagram of the inter-cell branchreplacement handover executed in the communication control plane.

2.4.3.5.6.3 Definitions of Information Flows and Associated InformationElements

Information flows in FIG. 51 will be described below and informationelements of the flows are represented in tables.

A HANDOVER CONNECTION SETUP request indication is sent from the TACFa toBCFa to notify of a handover initiation and to request to set up a newhandover link. The detail is represented in FIG. 480. The informationelement marked by *1 in FIG. 480 is mandatory in case that the networkhas more than one handover mode.

A HANDOVER CONNECTION SETUP response confirmation is sent from the BCFto TACF to confirm the HANDOVER CONNECTION SETUP request indication. Thedetail is represented in FIG. 481. The asterisked information element inFIG. 481 identifies the bearer between the BCFa and BCFv.

A BEARER SETUP request indication is sent from the TACFa to TACFv to setup a new handover link. The detail is represented in FIG. 482. Theasterisked information element in FIG. 482 identifies the link betweenthe BCFa and BCFv. There may be another functional entity for transitionof link between the BCFa and BCFv. The expression of inter-BCF linkshould be studied further.

Another BEARER SETUP request indication is sent from the TACF to BCF torequest a new handover link in the network. The detail is represented inFIG. 483. The asterisked information element in FIG. 483 identifies thelink between the BCFa and BCFv. There may be another functional entityfor transition of link between the BCFa and BCFv. The expression ofinter-BCF link should be studied further.

A BEARER SETUP response confirmation is sent from the BCF to TACF toconfirm a BEARER SETUP request indication. The detail is represented inFIG. 484. The asterisked information element in FIG. 484 identifies thelink between the BCF and BCFr. There may be another functional entityfor transition of link between the BCFa and BCFv. The expression ofinter-BCF link should be studied further.

A BEARER-AND-RADIO-BEARER SETUP request indication is sent from the TACFto BCFr to request to set up a bearer between the BCF and BCFr and aradio bearer. The detail is represented in FIG. 485.

A RADIO BEARER SETUP PROCEEDING request indication is sent from the BCFrto TACF to indicate that the request of the access radio link setup isaccepted and that the BCFr starts setting up the access radio link. Thedetail is represented in FIG. 486.i

A RADIO BEARER SETUP REQUEST request indication is sent from the visitedTACF, which controls the newly assigned access radio link, to TACFa torequest to set up the access radio link between the mobile terminal andthe BCFr controlled by the visited TACF. The detail is represented inFIG. 487.

A NON-SOFT HANDOVER EXECUTION request indication is sent from the TACFto TACAF to notify of a NON-SOFT HANDOVER EXECUTION request indicationand to request to replace an existing physical radio channel by adesignated physical radio channel. The detail is represented in FIG.488. The information element marked by *1 in FIG. 488 may be repeated aplurality of times, the number of repetition is the same as the numberof the handover branches related to the terminal. The informationelement marked by *2 in FIG. 488 may be repeated a plurality of times,the number of repetition is the same as the number of the access linksrelated to the TACF.

A RADIO BEARER SETUP request indication is sent from the TACAF to BCAFto request to set up an access radio link. The detail is represented inFIG. 489.

A RADIO BEARER SETUP response confirmation is a response to the RADIOBEARER SETUP request indication and is sent from the BCAF to TACAF toindicate the completion of the setup of the access radio link. Thedetail is represented in FIG. 490.

A RADIO BEARER RELEASE request indication is sent from the TACAF to BCAFto request to release the access radio link. The detail is representedin FIG. 491.

A RADIO BEARER RELEASE response confirmation is a response to the RADIOBEARER RELEASE request indication and is sent from the BCAF to TACAF torequest to release the access radio link. The detail is represented inFIG. 492.

A BEARER-AND-RADIO-BEARER SETUP response confirmation is a response tothe BEARER-AND-RADIO-BEARER SETUP request indication and is sent fromthe BCFr to TACF to indicate the completion of the setup of the accessradio link and the link between the BCFr and BCF. The detail isrepresented in FIG. 493.

A BEARER SETUP response confirmation is sent from the TACFa to TACFv toconfirm the establishment of the handover link. The detail isrepresented in FIG. 494.

A HANDOVER CONNECTION RELEASE request indication is sent from the TACFto BCFa to request to remove the indicated handover link. The detail isrepresented in FIG. 495.

A HANDOVER CONNECTION RELEASE response confirmation is sent from the BCFto TACF to confirm the HANDOVER CONNECTION RELEASE request indication.The detail is represented in FIG. 496.

A BEARER RELEASE request indication is sent from the TACFa to TACFv torequest to release the handover link in the network. The detail isrepresented in FIG. 497.

Another BEARER RELEASE request indication is sent from the TACF to BCFto request to release the handover link in the network. The detail isrepresented in FIG. 498.

A BEARER RELEASE response confirmation is sent from the BCF to TACF toconfirm the BEARER RELEASE request indication. The detail is representedin FIG. 499.

A BEARER-AND-RADIO-BEARER RELEASE request indication is sent from theTACF to BCFr to request to release the access link or handover linkbetween the BCF and BCFr and between BCAF and BCF. The detail isrepresented in FIG. 500. The asterisked information element in FIG. 500us included when this information flow is sent from the BCFr and TACF.

A BEARER-AND-RADIO-BEARER RELEASE response confirmation is a response tothe BEARER-AND-RADIO-BEARER RELEASE request indication and is sent fromthe BCFr to TACF to indicate the completion of the release of the accesslink or hand over link. The detail is represented in FIG. 501.

A BEARER RELEASE response confirmation is sent from the TACFv to TACFato confirm the BEARER RELEASE request indication. The detail isrepresented in FIG. 502.

2.4.3.5.7 ACCH Replacement

FIG. 790 shows a part of the invented system for describing the ACCHreplacement. In FIG. 790, a service control center 1, connected to apublic network (not shown), controls or manages a plurality of (two inthe example in FIG. 790) mobile service switching centers 2 a and 2 b.Each mobile service switching center 2 a or 2 b is connected with a basestation controller 3 a or 3 b via a plurality of lines. The base stationcontroller 3 a controls base stations 6 a to 6 d while the base stationcontroller 3 b controls base stations 6 e to 6 h. The base stations 6 ato 6 h possess radio zones 5 a to 5 h, respectively, and one of the basestations is communicable with a mobile station 7 when the mobile station7 visits the corresponding radio zone.

In relation to FIG. 790, assume that the mobile station 7 exists in theradio zone 5 b and treats a plurality of calls using a plurality oftraffic channels. At least one ACCH (associated control channel),utilizing the same radio resources as those for one of the trafficchannels that are used for voice or data transportation, is necessary.

As already described at section 2.2.2, one ACCH (for example, ACCH1 inFIG. 790) is selected in accordance with the invented system, and isused for transporting all of the control signals involved in the mobilestation 7. Therefore, it is possible to reduce the number of hardwareelements for transporting control signals in comparison with the casethat the calls respectively utilize multiple ACCHs. In addition, it ispossible to exclude complicated control procedures, e.g., adjustment ofthe transportation order of control information in the plurality ofACCHs.

In such a communications system, however, when a set of wirelesscommunication resources involved in the single ACCH is released due tothe release of one of the traffic channels by the ending of the call, itis difficult to secure the ACCH to continue the other call. The sameproblem may occur when the transmission rate in the ACCH is altered.Consequently, when the radio resources involved in the employed ACCH arereleased due to a connection or call release, and when another callshould be continued, ACCH replacement is necessary. ACCH replacement isalso necessary when altering the transmission rate in the ACCH.

Accordingly, in addition to sharing the single ACCH by the multipletraffic channels for realizing the multiple calls simultaneously by thesingle mobile station 7, when the single set of wireless communicationresources involved in the single ACCH is released, the ACCH is replacedby another ACCH.

2.4.3.5.7.2 Information Flow Diagram

a) Functional Model

FIG. 52 shows functional entities involved in the ACCH replacement ofthe invented system. As shown in FIG. 52, these functional entities canbe categorized into two types: the first type is functional entitiesarranged in the mobile terminal and the second type is functionalentities arranged in the visited network including base stations. Thearrangement and the function of the functional entities will bedescribed next briefly.

The mobile communications control center 2 a or 2 b in FIG. 790 isprovided with a CCFa (call control function) which is a functionalentity for controlling call and connection. The index “a” of CCFa is theabbreviation of “anchor” that means it is fixed at the start ofcommunication and does not move although the mobile terminal 6 moves.

The base station controller 3 a or 3 b is provided with a TACFa(terminal access control function) and a BCFa (bearer control function).The TACFa is a functional entity for controlling the access from thenetwork to the mobile station 7 and for instructing the activation andrelease of the ACCH. The BCFa (bearer control function) is a functionalentity for controlling the bearer. As similar to above, the index “a” isthe abbreviation of “anchor.”

The base station controller 3 a or 3 b, which may be the same as orother than that with the TACFa and BCFa, is provided with a TACFv andBCFv. The index “v” is the abbreviation of “visited.”

Either of the base stations 4 a and 4 b that are controlled by the basestation controller with the TACFv and BCFv is provided with a BCFr(bearer control function) associated with radio bearers. The BCFrcontrols radio bearers and activates and releases the ACCH.

The mobile terminal 6 is provided with a TACAF (terminal access controlagent function) and BCAF (bearer control agent function). The TACAF is afunctional entity for controlling the access to the mobile terminal andfor instructing the release and establishment of the ACCH. The BCAF is afunctional entity for controlling the radio bearer of the mobileterminal and for executing the release and establishment of the ACCH.

The index “1” or “2” is attached to the functional entities. The index“1” means that the corresponding entity is served for the first callwhile the index “2” means that the corresponding entity is served forthe second call within a plurality of calls that the mobile terminal 7is carrying out.

(b) Information Flows

FIGS. 53 and 54 cooperate to form an information flow diagram showingthe ACCH replacement procedure executed in the communication controlplane.

2.4.3.5.7.3 Definitions of Information Flows and Associated InformationElements

Information flows and information elements in FIGS. 53 and 54 will bedescribed below and the information elements are represented in tables.With reference to the sequential chart in FIGS. 53 and 54, the ACCHreplacement procedure will be described.

The ACCH replacement procedure in FIGS. 53 and 54 is started under thecondition described below.

(a) Previously, a mobile station has treated first and second callsusing traffic channels TCH1 and TCH2.

(b) Then, the first call by the traffic channel TCH1 is now beingfinished.

(c) An associated control channel ACCH1 and the traffic channel TCH1have used the same radio resources. The associated control channel ACCH1has been commonly shared by the first and second calls for transportingcontrol signals.

(d) The traffic channel TCH1 and the associated control channel ACCH1will be released due to the finish of the first call. However, it isnecessary to maintain the second call through the traffic channel TCH2,so that another associated control channel is necessary. Therefore, itis necessary to replace the associated control channel ACCH1 by anotherassociated control channel ACCH2 that uses the same resources as of thetraffic channel TCH2.

Consequently, the procedure illustrated in FIGS. 53 and 54 starts underthe conduction, which is the same as that, under which the procedureillustrated in FIG. 262 starts. In other words, the chart shown in FIGS.53 and 54 is essentially the same as the chart in FIG. 262, butrepresents in more detail the replacement procedure for replacing theradio bearer between the BCAF1 and BCFr1 for the first call with theradio bearer between the BCAF2 and BCFr2 for the second call.

When conditions (a) to (d) are satisfied, a trigger for replacing ACCHis generated as represented in FIG. 53. If the TACFa detects thistrigger, the TACFa determines a connection to which the ACCH should benewly setup and then sends a HANDOVER CONNECTION SETUP requestindication to the BAFa to notify of the handover initiation and torequest to setup an ACCH. As represented in FIG. 503, the HANDOVERCONNECTION SETUP request indication contains a BCF-TACF relationship IDelement, base station ID element, and handover mode element. In thetables, “M” is the abbreviation of mandatory while “O” is theabbreviation of optional. The handover mode element in FIG. 503 ismandatory when the network has more than one handover mode.

As shown in FIG. 53, the BCFa captures a DHT for the new ACCH, and thensends a HANDOVER CONNECTION SETUP response confirmation to the TACFa toconfirm the HANDOVER CONNECTION SETUP request indication. The HANDOVERCONNECTION SETUP response confirmation contains a TACF-BCF relationshipID element and inter-BCF bearer ID element as represented in FIG. 504.The bearer ID element in FIG. 504 identifies the bearer between the BCFaand BCFv.

Then, a BEARER SETUP request indication is sent from the TACFa toTACFv2, which corresponds to the second call, to setup an access bearerfor the ACCH. The BEARER SETUP request indication contains a TACF-BCFrelationship ID element, inter-BCF bearer ID element, base station IDelement, and user information rate element as represented in FIG. 505.The bearer ID element identifies the bearer between the BCFa and BCFv.

The TACFv2 sets up a to-BTS short cell connection for the ACCH and thenselects a link reference which is the same as of that the trafficchannel TCH2 for realizing the second call. Then, the TACFv2 sendsanother BEARER SETUP request indication to the BCFv2. The BEARER SETUPrequest indication requests to setup a bearer for ACCH2 which isassociated with the traffic channel TCH2. The BEARER SETUP requestindication contains a TACF-BCF relationship ID element, inter-BCF bearerID element, user information rate element, and base station ID element,as represented in FIG. 506. The bearer ID element identifies the bearerbetween the BCFa and BCFv.

Once the BCFv2 receives the BEARER SETUP request indication, the BCFv2setup the requested bearer and sends a BEARER SETUP responseconfirmation to the TACFv2 to confirm the BEARER SETUP requestindication. The BEARER SETUP response confirmation contains a TACF-BCFrelationship ID element and BCF-BCFr bearer ID element as represented inFIG. 507. The bearer ID identifies the bearer between the BCF and BCFr.

When the TACFv2 receives the BEARER SETUP response confirmation, TACFv2sends a BEARER-AND-RADIO-BEARER SETUP request indication to the BCFr2 torequest to setup a bearer between the BCF and BCFr and a radio bearerfrom the ACCH. The BEARER-AND-RADIO-BEARER SETUP request indicationcontains a TACF-BCFr relationship ID element and bearer ID element asrepresented in FIG. 508.

Upon the reception of the BEARER-AND-RADIO-BEARER SETUP requestindication, the BCFr2 in light of the link reference specifies thetraffic channel TCH2 and enables to start the transmission throughACCH2. Then, the BCFr2 sends a RADIO BEARER SETUP PROCEEDING requestindication to the TACFv2 to indicate that the request of the radiobearer setup is accepted and that the BCFr starts setting up the radiobearer for ACCH2. The RADIO BEARER SETUP PROCEEDING request indicationcontains a TACF-BCFr relationship ID as represented in FIG. 509.

Upon the reception of the RADIO BEARER SETUP PROCEEDING requestindication, a RADIO BEARER SETUP REQUEST request indication is sent fromthe visited TACFv2, which controls the newly assigned radio bearer, tothe TACFa to request to setup a radio bearer for ACCH2 between themobile terminal and the BCFr controlled by the visited TACF. The RADIOBEARER SETUP REQUEST request indication contains a TACF-TACFrelationship ID as represented in FIG. 510.

Next, another RADIO BEARER SETUP request indication is sent from theTACFa to TACAF to notify of the ACCH replacement handover executioninitiation and to request to replace the existing physical radio channelfor the first call with the designated physical radio channel for theACCH. The RADIO BEARER SETUP request indication contains a call ID asrepresented in FIG. 511.

Upon the reception of the RADIO BEARER SETUP request indication, theTACAF as shown in FIG. 54 sends BCAF2 another RADIO BEARER SETUP requestindication. The RADIO BEARER SETUP request indication requests to setupa radio bearer for the ACCH (ACCH2) and contains a TACAF-BCAFrelationship ID as represented in FIG. 512.

Upon the reception of the RADIO BEARER SETUP request indication, theBCAF2 establishes the new ACCH and then sends a RADIO BEARER SETUPresponse confirmation to the TACAF to indicate the completion of theradio bearer setup for the new ACCH. The RADIO BEARER SETUP responseconfirmation contains a TACAF-BCAF relationship ID as represented inFIG. 513.

Then, the TACAF sends another RADIO BEARER SETUP response confirmationto the TACFa to indicate the completion of setting up of the radiobearer for the ACCH (ACCH2). The RADIO. BEARER SETUP responseconfirmation contains a TACAF-BCAF relationship ID in the same fashionas that represented in FIG. 513.

Next, the TACAF sends the BCAF1 a RADIO BEARER RELEASE requestindication to request to release the previous radio bearer. The RADIOBEARER RELEASE request indication contains a TACAF-BCAF relationship IDas represented in FIG. 514.

Upon the reception of the RADIO BEARER RELEASE request indication, theBCAF1 releases the previously employed ACCH (ACCH1 associated with thetraffic channel TCH1) and then replies a RADIO BEARER RELEASE responseconfirmation to the TACAF to indicate the completion of the radio bearerrelease. The RADIO BEARER RELEASE response confirmation contains aTACAF-BCAF relationship ID as represented in FIG. 515.

On the other hand, when receiving the RADIO BEARER SETUP responseconfirmation, the TACFa sends the BCFa a HANDOVER CONNECTION RELEASErequest indication to request to remove the previous bearer in the softhandover state. The HANDOVER CONNECTION RELEASE request indicationcontains a TACF-BCF relationship ID element and released bearer IDelement as represented in FIG. 516.

Upon the reception of the HANDOVER CONNECTION RELEASE requestindication, the BCFa releases the previous DHT and sends a HANDOVERCONNECTION RELEASE response confirmation to the TACFa to confirm theHANDOVER CONNECTION RELEASE request indication. The HANDOVER CONNECTIONRELEASE response confirmation contains a TACF-BCF relationship ID asrepresented in FIG. 517.

Next, the TACFa sends the TACFv1 a BEARER RELEASE request indication torequest to release the access bearer. The BEARER RELEASE requestindication contains a TACF-TACF relationship ID as represented in FIG.518.

Upon the reception of the BEARER RELEASE request indication, the TACFv1sends the BCFv1 another BEARER RELEASE request indication to request torelease the bearer. The BEARER RELEASE request indication contains aTACF-BCF relationship ID as represented in FIG. 519.

Upon the reception of the BEARER RELEASE request indication, the BCFv1sends the TACFv1 another BEARER RELEASE request indication to confirmthe BEARER RELEASE request indication, and then release the previousresources. The BEARER RELEASE response confirmation contains a TACF-BCFrelationship ID element as represented in FIG. 520.

Upon the reception of the BEARER RELEASE response confirmation, theTACFv1 sends the BCFr1 a BEARER-AND-RADIO-BEARER RELEASE requestindication to request to release the bearer between the BCF and BCFr andthe radio bearer. The BEARER-AND-RADIO-BEARER RELEASE request indicationcontains a TACF-BCFr relationship ID element and a cause element asrepresented in FIG. 521. The cause element is however included when thisinformation element is sent from the BCFr to TACF.

On the other hand, when receiving the BEARER-AND-RADIO-BEARER RELEASErequest indication, the BCFr1 stops the transmission. Then, the BCFr1sends the TACFv1 a BEARER-AND-RADIO-BEARER RELEASE response confirmationand then releases the previous resources. The BEARER-AND-RADIO-BEARERRELEASE response confirmation is a response to theBEARER-AND-RADIO-BEARER request indication and indicates the completionof the release of the bearer and radio bearer. TheBEARER-AND-RADIO-BEARER RELEASE response confirmation contains aTACF-BCFr relationship ID as represented in FIG. 522.

Upon the reception of the BEARER-AND-RADIO-BEARER RELEASE responseconfirmation, the TACFv1 sends the TACFa a BEARER RELEASE responseconfirmation to confirm the BEARER RELEASE request indication. TheBEARER RELEASE response confirmation contains a TACF-TACF relationshipID as represented in FIG. 523.

In the above description of the ACCH replacement procedure, it isomitted to describe the procedure when the mobile station carries outthe diversity handover for simplifying the description. If the mobilestation 7 (refer to FIG. 790) carries out the diversity handover, theabove-mentioned functional entities (TACFv1 BCFv1 TACFv2, BCFv2, BCFr1,BCFr2) are respectively provided with the base station controllers orthe base stations, to which branches are established, and are controlledby the TACFa in the same manner as represented in FIGS. 53 and 54.Accordingly, the ACCH replacement may be executed even at the diversityhandover status. In this case, information elements are simultaneouslytransported between the TACFa of all of the base station controllers andthe TACAFv of the mobile terminal.

In the ACCH replacement procedure, a wired access link is newlyestablished between a base station controller at which the TACFa isdisposed and a base station, and then the radio access link between themobile terminal and the network is replaced. Accordingly, the ACCHreplacement is accomplished.

However, in an alteration, it is possible to replace the ACCH withoutthe new establishment of the wired access link. This alteration will bedescribed with reference to FIG. 791.

As represented in FIG. 791, a trigger for replacing ACCH is generated.If the TACFa detects this trigger, the TACFa determines a connection towhich the ACCH should be newly setup; and then sends an ACCH REPLACEMENTSETUP request indication to the TACFv2 where the new ACCH should besetup. Upon the reception of the reception, the TACFv2 further sends anACCH REPLACEMENT SETUP request indication to the BCFr2. As a result, theBCFr2 sets up the new ACCH and starts transmission through the ACCH.Then, the BCFr2 replies a notification of the completion of the ACCHsetup to the TACFv2. Upon the reception of the reception of thenotification, the TACFv2 sends another notification of the completion ofthe ACCH setup to the TACFa. The TACFa sends a RADIO ACCESS LINK SETUPrequest indication as similar to the foregoing procedure represented inFIGS. 53 and 54. As a result, the BCAF2 sets up the new ACCH while theBCAF1 releases the existent ACCH. In addition, the TACAF sends the TACFaa RADIO ACCESS LINK SET UP response confirmation.

Upon the reception of the RADIO ACCESS LINK SETUP response confirmation,the TACFa sends the TACFv1 an ACCH RELEASE request indication. Then, theTACFv1 further sends the ACCH RELEASE request indication to the BCFr1.As a result, the BCFr1 stops transmission through the existent ACCH,releases the existent ACCH and sends back the TACFv1 an ACCH RELEASEresponse confirmation. Then, the TACFv1 notifies the TACFa of thecompletion of the release of the existent ACCH.

In this procedure, since the ACCH replacement is accomplished by thefunctional entities illustrated in FIG. 791, it is not carried out tonewly set up a radio access link in the network.

2.4.3.5.8 Code Replacement

2.4.3.5.8.2 Information Flow Diagram

a) Functional Model

FIG. 55 shows the functional model of a part of the invented system fordescribing a code replacement.

b) Information Flows

FIG. 56 shows an information flow diagram of the code replacementexecuted in the communication control plane.

2.4.3.5.8.3 Definitions of Information Flows and Associated InformationElements

Information flows and information elements in FIG. 56 will be describedbelow and the information elements are represented in tables.

A CODE REPLACEMENT request indication is sent from a BCFr to a TACF torequest change of codes. The detail of the CODE REPLACEMENT requestindication is represented in FIG. 524.

Another CODE REPLACEMENT request indication is sent from the visitedTACF to a TACFa to request change of codes. The detail of the CODEREPLACEMENT request indication is represented in FIG. 525.

Another CODE REPLACEMENT request indication is sent from the TACF to aTACAF to request change of codes. The detail of the CODE REPLACEMENTrequest indication is represented in FIG. 526. The element marked by *1in FIG. 526 may be repeated a plurality of times, the number ofrepetition is the same as the number of the handover branches related tothe terminal. The element marked by *2 in FIG. 526 may be repeated aplurality of times, the number of repetition is the same as the numberof calls related to the TACF.

Another CODE REPLACEMENT request indication is sent from the TACAF tothe BCAF to request to change of codes. The detail of the CODEREPLACEMENT request indication is represented in FIG. 527.

A CODE REPLACEMENT response confirmation is a response to the CODEREPLACEMENT request indication and is sent from the BCAF to the TACAF toindicate the completion of the change of codes. The detail of the CODEREPLACEMENT response confirmation is represented in FIG. 528.

Another CODE REPLACEMENT response confirmation is a response to the CODEREPLACEMENT request indication and is sent from the TACAF to the TACFato confirm the CODE REPLACEMENT request indication. The detail of theCODE REPLACEMENT response confirmation is represented in FIG. 529.

Another CODE REPLACEMENT response confirmation is sent from the TACFa tothe TACFv to confirm the CODE REPLACEMENT request indication. The detailof the CODE REPLACEMENT response confirmation is represented in FIG.530.

Another CODE REPLACEMENT response confirmation is sent from the TACF tothe BCFr to confirm the CODE REPLACEMENT request indication. The detailof the CODE REPLACEMENT response confirmation is represented in FIG.531.

2.4.3.6 Transmission Power Control

2.4.3.6.2 Information Flow Diagram

a) Functional Model

FIG. 57 shows the functional model of a part of the invented system fordescribing a transmission power control.

b) Information Flows

FIG. 58 shows an information flow diagram of the transmission powercontrol executed in the communication control plane.

2.4.3.6.3 Definitions of Information Flows and Associated InformationElements

Information flows and information elements in FIG. 58 will be describedbelow and the information elements are represented in tables.

A CELL CONDITION REPORT request indication is sent from an MRRC to anRRC periodically to notify of the radio conditions of respectivehandover branches. The detail of the CELL CONDITION REPORT requestindication is represented in FIG. 532.

A TRANSMISSION POWER CONTROL request indication is sent from a TACFa toTACFv to notify of the instructed transmission power. The detail of theTRANSMISSION POWER CONTROL request indication is represented in FIG.533.

Another TRANSMISSION POWER CONTROL request indication is sent from aTACFv to BCFr to notify of the instructed transmission power. The detailof the TRANSMISSION POWER CONTROL request indication is represented inFIG. 534.

2.4.4 Information Flows of Mobility Services

2.4.4.1 Terminal Location Updating

2.4.4.1.1 Common Procedure Modules Used

Common procedure modules used within the terminal location updatingservice are the TMUI inquiry, the FPLMTS user ID retrieval, the userauthentication procedure, the ciphering start time notification, and theTMUI assignment.

2.4.4.1.2 Information Flow Diagram

a) Functional Model

FIG. 59 shows the functional model of a part of the invented system fordescribing a terminal location updating.

b) Information Flows

FIGS. 60 and 61 form an information flow diagram of the terminallocation updating.

2.4.4.1.3 Definitions of Information Flows and Associated InformationElements

Information flow in FIGS. 60 and 61 will be described below andinformation elements of the flows are represented in tables.

Relationship rd (LRCF-LRDF)

An LAI UPDATE request indication is sent from the visited SCF to the SDFfor requesting to update the location area information. A responseconfirmation is returned to the visited SCF from the SDF to confirm thecompletion of updating the location area information. FIG. 535represents the details of the LAI UPDATE request indication and the LAIUPDATE response confirmation.

Relationship rk (SACF-LRCF)

A TERMINAL LOCATION UPDATE request indication is sent from the SACF tothe visited SCF for requesting to update the location information of themobile terminal. A response confirmation is returned to the SACF fromthe visited SCF to confirm the completion of updating the terminallocation information. FIG. 536 represents the details of the TERMINALLOCATION UPDATE request indication and the TERMINAL LOCATION UPDATEresponse confirmation.

Relationship rl (MCF-SACF)

Another TERMINAL LOCATION UPDATE request indication is sent from the MCFto the SACF for requesting to update the location information of themobile terminal. A response confirmation is returned to the MCF from theSACF to confirm the completion of updating the terminal locationinformation. FIG. 537 represents the details of the TERMINAL LOCATIONUPDATE request indication and the TERMINAL LOCATION UPDATE responseconfirmation.

[Notes}

1) The relationship ID element identifies the relationship betweenrequests and responses.

2) TMUI and TMUI assignment source ID should be used for the FPLMTS userID element for relationships rl and rk.

3) The terminal status element indicates whether the terminal can accepta call or not.

4) The TC information is a terminal data information which indicatesterminal capabilities.

2.4.5 Information Flows of Security Services

2.4.5.1 User Authentication

a) Functional Model

FIG. 62 shows the functional model of a part of the invented system fordescribing a user authentication.

b) Information Flows

FIG. 63 shows an information flow diagram of the user authentication.

c) Definitions of Information Flows, Information Elements, andFunctional Entity Actions

Information flows and functional entity actions in FIG. 63 will bedescribed below and information elements of the flows are represented intables.

Relationship rd (LRCF-LRDF)

An authentication information retrieval information flow is used torequest the security information from the visited LRDF for the userauthentication. FIG. 538 represents the detail of the AUTHENTICATIONINFORMATION RETRIEVAL request indication and the AUTHENTICATIONINFORMATION RETRIEVAL response confirmation.

Relationship rg (LRCF-TACF) and Relationship rk(LRCF-SACF)

An AUTHENTICATION CHALLENGE IF is used to verify the identity of theuser. That is, an authentication challenge initiated by a network issent from LRCF to TACF/SACF for requesting the return of theauthentication calculation result. FIG. 539 represents the detail of theAUTHENTICATION CHALLENGE request indication and the AUTHENTICATIONCHALLENGE response confirmation.

Relationship rb (TACFF-TACAF) and Relationship rl (SACF-MCF)

Another AUTHENTICATION CHALLENGE IF is used to verify the identity ofthe user. That is, an authentication challenge initiated by the networkis sent from TACFF to TACAF and from SACF to MCF for requesting thereturn of the authentication calculation result. FIG. 540 represents thedetail of the AUTHENTICATION CHALLENGE request indication and theAUTHENTICATION CHALLENGE response confirmation.

Relationship rv(UIMF-TACAF) and Relationship ry (UIMF-MCF)

An AUTHENTICATION request indication is used to send a random number andto request to calculate a response with the random number andauthentication key retained in the UIMF. An AUTHENTICATION responseconfirmation is used to send the authentication calculation result. FIG.541 represents the detail of the AUTHENTICATION request indication andthe AUTHENTICATION response confirmation.

2.4.5.2 Ciphering Start Time Notification

2.4.5.2.1 Information Flow Diagram

a) Functional Model

FIG. 64 shows the functional model of a part of the invented system fordescribing a ciphering start time notification.

b) Information Flows

FIG. 65 shows an information flow diagram of the ciphering start timenotification.

c) Definitions of Information Flows, Information Elements, andFunctional Entity Actions

Information flows and functional entity actions in FIG. 65 will bedescribed below and information elements of the flows are represented intables.

Relationship rb (TACF-TACAF)

A START CIPHERING request indication is used to request that theterminal begins to apply the encryption procedure to informationtransmitted between itself and the network. This needs a confirminginformation flow.

Relationship rg (LRCF-TACF)

Another START CIPHERING request indication is used to request that theterminal begins to apply the encryption procedure to informationtransmitted between itself and the network. This needs a confirminginformation flow. FIG. 542 represents the details of the START CIPHERINGrequest indication and the START CIPHERING response confirmation.

Relationship rk (LRCF-SACF)

Another START CIPHERING request indication is used to request that theterminal begins to apply the encryption procedure to informationtransmitted between itself and the network. This needs a confirminginformation flow. FIG. 543 represents the details of the START CIPHERINGrequest indication and the START CIPHERING response confirmation.

Relationship rl (SACF-MCF)

Another START CIPHERING request indication is used to request that theterminal begins to apply the encryption procedure to informationtransmitted between itself and the network. This needs a confirminginformation flow.

2.4.5.3. TMUI Management and User ID Retrieval

2.4.5.3.1 TMUI Assignment

2.4.5.3.1.1 Information Flow Diagram

a) Functional Model

FIG. 66 shows the functional model of a part of the invented system fordescribing a TMUI assignment.

b) Information Flows

FIG. 67 shows an information flow diagram of the TMUI assignment. InFIG. 67, the relationship between MCF and SACF is used for the userauthentication in non-call related case while the relationship betweenTACAF and TACF is used for the user authentication in call related case.However, this could be accommodated with the relationship between MCFand SACF as well. An AUTHENTICATION INFORMATION RETRIEVAL requestindication and an AUTHENTICATION INFORMATION response confirmation areused if no user authentication information is available in the visitednetwork.

c) Definitions of Information Flows, Information Elements, andFunctional Entity Actions

Information flows and functional entity actions in FIG. 67 will bedescribed below and information elements of the flows are represented intables.

Relationship rb (TACF-TACAF)

A TMUI ASSIGNMENT request indication is used to assign and convey theTMUI to the user after the network has verified the identity of theuser. A response confirmation is returned for acknowledging thesuccessful assignment of the TMUI. FIG. 544 represents the details ofthe TMUI ASSIGNMENT request indication and the response confirmation.

Relationship rd (LRCF-LRDF)

A TMUI QUERY IF is used to request a new TMUI available from the visitedLRDF. FIG. 545 represents the details of the TMUI QUERY requestindication and response confirmation.

A TMUI MODIFY request indication is used to request the visited LRDF tomodify the TMUI information for the user. Then, a confirmation is sentafter it has been modified. FIG. 546 represents the details of the TMUIMODIFY request indication and response confirmation.

Relationship rg (LRCF-TACF)

Another TMUI ASSIGNMENT request indication is used to assign and conveythe TMUI to the user after the network has verified the identity of theuser. A response confirmation is returned for acknowledging thesuccessful assignment of the TMUI. FIG. 547 represents the details ofthe TMUI ASSIGNMENT request indication and the response confirmation.

Relationship rk (LRCF-SACF)

Another TMUI ASSIGNMENT request indication is used to assign and conveythe TMUI to the user after the network has verified the identity of theuser. A response confirmation is returned for acknowledging thesuccessful assignment of the TMUI. FIG. 548 represents the details ofthe TMUI ASSIGNMENT request indication and the response confirmation.

Relationship rl (SACF-MCF)

Another TMUI ASSIGNMENT request indication is used to assign and conveythe TMUI to the user after the network has verified the identity of theuser. A response confirmation is returned for acknowledging thesuccessful assignment of the TMUI. FIG. 549 represents the details ofthe TMUI ASSIGNMENT request indication and the response confirmation.

2.4.5.3.2 User ID Retrieval

This procedure is used to convert the TMUI to the IMUI of an FPLMTSuser. This procedure is initiated by the newly visited network when thenetwork receives the TMUI or a set of TMUI and TMUI assignment source IDas the FPLMTS user ID from the mobile terminal. When newly visited LRCFreceives the TMUI or a set of TMUI and TMUI assignment source ID fromthe mobile terminal, the LRCF should analyze which procedure (selectedfrom the following procedures) would be executed.

1) Terminal Location Registration and Update

Case A) TMUI has been assigned by the newly visited LRDF.

Case B) TMUI has been assigned by another LRDF.

In this rule, case B is not described.

2) Mobile Originating Call

3) Unsuccessful Case: If the newly visited network cannot retrievesuccessfully (e.g., loses TMUI), then the newly visited network attemptsto retrieve the FPLMTS user's IMUI from the UIMF.

2.4.5.3.2.1 Information Flow Diagram

FIG. 68 shows an information flow diagram of the user ID retrieval.

2.4.5.3.2.2 Information Flows and Associated Information Elements

Relationship rd (LRCF-LRDF)

An IMUI RETRIEVAL request indication is used to retrieve an IMUI on thebasis of its corresponding TMUI. This information flow is sent from theLRCF to the LRDF in the same network. An IMUI RETRIEVAL responseconfirmation is a response to the request indication. The details of theIMUI RETRIEVAL request indication and response confirmation arerepresented in FIG. 550. In case that a call is originated from themobile terminal, the TMUI assignment source ID element in FIG. 550 isnot included.

Relationship rl (SACF-LRCF)

Another IMUI RETRIEVAL request indication is used to retrieve the IMUIfrom the mobile terminal. This information flow is used only when thenetwork does not convert the TMUI of the FPLMT user into the IMUI. Thisinformation flow is sent from the SCF to the SACF in the visitednetwork. An IMUI RETRIEVAL response confirmation is a response to therequest. The details of the IMUI RETRIEVAL request indication andresponse confirmation are represented in FIG. 551.

Relationship rk (MCF-SACF)

Another IMUI RETRIEVAL request indication is used to retrieve the IMUIfrom the mobile terminal. This information flow is used only when thenetwork does not convert the TMUI of the FPLMT user into the IMUI. Thisinformation flow is sent from the SACF to the MCF in the visitednetwork. An IMUI RETRIEVAL response confirmation is a response to therequest. The details of the IMUI RETRIEVAL request indication andresponse confirmation are represented in FIG. 552.

Relationship rg (TACF-LRCF)

Another IMUI RETRIEVAL request indication is used to retrieve the IMUIfrom the mobile terminal. This information flow is used only when thenetwork does not convert the TMUI of the FPLMT user into the IMUI. Thisinformation flow is sent from the LRCF to the TACF in the visitednetwork. An IMUI RETRIEVAL response confirmation is a response to therequest. The details of the IMUI RETRIEVAL request indication andresponse confirmation are represented in FIG. 553.

Relationship rb (TACAF-TACF)

Another IMUI RETRIEVAL request indication is used to retrieve the IMUIfrom the mobile terminal. This information flow is used only when thenetwork does not convert the TMUI of the FPLMT user into the IMUI. Thisinformation flow is sent from the TACF to the TACAF in the visitednetwork. An IMUI RETRIEVAL response confirmation is a response to therequest. The details of the IMUI RETRIEVAL request indication andresponse confirmation are represented in FIG. 554.

2.4.6 SDL Diagrams

SDL diagrams for functional entities (FIGS. 254 to 258) complies withIMT-2000 Recommendation Draft Q.FIF. Scenario 3 in the access link setupprocedure, however, shall not be applied in this document. The numberattached in the texts on the information flow transmission/receptionbetween FEs in the SDL diagrams indicates the FEA number in the ITURecommendation Draft Q.FIF.

2.5 Protocol Specifications

2.5.1 Reference Configuration

The correlation between physical node configuration and functionalentities in the invented system is represented in FIG. 69. The system isprovided with radio interfaces and BTS-MCC interfaces to specify theprotocol.

2.5.2 Radio Interface Specification

2.5.2.1 General

Section 2.5.2 describes layer 1-3 protocol specifications for the radiointerface.

2.5.2.2 Layer 1

The description in connection with layer 1 protocol is omitted.

2.5.2.3 Layer 2

2.5.2.3.1 General

Layer 2 consists of a LAC (link access control) sub-layer and a MAC(medium access control) sub-layer. The LAC sub-layer consists of alayer-3-coordination sub-sub-layer and an LLC (logical link control)sub-sub-layer. FIG. 70 shows the signaling layer 2 protocol architectureover the radio interface. FIG. 71 shows a sample frame structure for theBSC function termination.

2.5.2.3.1.1 LAC (Link Access Control) Sub-Layer

The LAC transfers variable length service data units (SDUs) betweenusers at layer 2 with high reliability.

2.5.2.3.1.1.1 Layer-3-Coordination Sub-Sub-Layer

The layer-3-coordination sub-sub-layer performs primitive/parametermapping between LLC, and layer 3, and disassembles/assembles a layerdata unit to/from LLC SDUs.

2.5.2.3.1.1.2 LLC (Logical Link Control) Sub-Sub-Layer

The LLC sub-sub-layer offers a high-reliability transfer function usingerror control, flow control, and so on.

2.5.2.3.1.2 MAC (Medium Access Control) Sub-Layer

The MAC sub-layer detects an error of LLC PDUs anddisassembles/assembles an LLC PDU to/from layer 1 frames.

2.5.2.3.2 Functions

2.5.2.3.2.1 Functions of LAC (Link Access Control) Sub-Layer

2.5.2.3.2.1.1 Layer-3-Coordination Sub-Sub-Layer

a) Signaling Layer 3 PDU Assembly and Disassembly

This function provides for assembling a signaling layer 3 data unit fromLLC PDUs and for disassembling a signaling layer 3 PDU to LLC PDUs.

b) Link Control

This function specifies the layer 3 entity which should process the LACSDU with the SAPI. The application should be studied further.

c) Code Type Identification

This function identifies the code type when adopting the hybrid ARQ.

2.5.2.3.2.1.2 LLC (Logical Link Control) Sub-Sub-Layer

a) Sequence Integrity

This function preserves the order of LLC SDUs that were submitted fortransfer by this layer.

b) Error Correction by Selective Retransmission

Through a sequencing mechanism, the receiving LLC entity can detectmissing LLC SDUs. This function corrects the sequence errors by means ofretransmission.

c) Flow Control

This function allows an LLC receiver to control the rate at which a peerLLC transmitter entity may send information.

d) Error Reporting to Layer Management

This function indicates to layer management errors which have occurred.

e) Keep Alive

This function verifies that two peer LLC entities participating in alink are remaining in a link connection established state even in thecase of a prolonged absence of data transfer.

f) Local Data Retrieval

This function allows the local LLC user to retrieve in-sequence SDUswhich have not yet been released by the LLC entity.

g) Connection Control

This function performs the establishment, release, and resynchronizationof an LLC link. It also allows the transmission of variable lengthuser-to-user information without a guarantee of delivery.

h) Transfer of User-Data

This function is used for the conveyance of user data between users ofthe LLC. LLC supports both assured and unassured data transfer.

i) Protocol Error Detection and Recovery

This function detects errors and recovers from errors in the operationof the protocol.

j) Status Reporting

This function allows a transmitter peer entity and a receiver peerentity to exchange status information.

2.5.2.3.2.2 Functions of MAC (Medium Access Control) Sub-Layer

a) CRC Error Detection and Handling

This function provides for detecting and handling LLC PDU corruption bymeans of CRC. Corrupted LLC PDUs are discarded.

b) Assembly and Disassembly of LLC PDU or BTS Layer 3 PDU from/to Layer1 Frames

This function provides for assembling an LLC PDU or BTS layer 3 PDU fromlayer 1 frames and for disassembling an LLC PDU or BTS layer 3 PDU tolayer 1 frames.

This function includes the padding function to extend the length of theMAC PDU to an integer multiple of the length of layer 1 frames. Beforetransferring through the RACH, a sequence number should be attached inorder to prevent the MAC PDU from being received twice.

c) Address Control

This function identifies the logical link in the RACH/FACH, e.g., forrespective mobile terminals, using a personal identity system.

d) Identity of Signal Content

This function classifies information, transmitted over the RACH, FACH,and UPCH, into user information or control information.

e) Identity of Terminating Node

This function classifies nodes, where signals are terminated, into theBTS function node and the BSC function node.

2.5.2.3.3 Formats and Parameters of Data Units

2.5.2.3.3.1 Format and Parameters of PDUs in LAC Sub-Layer

2.5.2.3.3.1.1 Layer 3 Compatible Sub-Sub-Layer PDU

a) SAPI (Service Access Point Identifier)

This indicates to layer 3 the type of service provided by layer 2. Thisparameter is represented in FIG. 555.

b) ST

This parameter is attached to layer 3 compatible sub-sub-layer PDUs whendisassembling a layer 3 PDU to those. This parameter is referred forfuture assembling a layer 3 PDU estimation from those in the correctorder. This parameter is represented in FIG. 556.

c) Code Type Indicator

This parameter indicates the type of code to adopt the hybrid ARQ. Theadoption shall depend on the version. This parameter is represented inFIG. 557.

d) Reserved Parameter

This parameter indicates the version of layer-3-coordinationsub-sub-layer, and so on. This parameter is represented in FIG. 558.

2.5.2.3.3.1.2 LLC PDUs

2.5.2.3.3.1.2.1 Types of LLC PDUs

Various types of LLC protocol data units (PDUs) are listed in FIGS. 559and 560. Definitions of the types of LLC PDUs will be described below.

a) BGN PDU (Begin)

The BGN PDU is used to establish an LLC link between two peer entities.The BGN PDU requests to clear peer's transmitter and receiver buffers,and to initialize peer's transmitter and receiver state variables.

b) BGAK PDU (Begin Acknowledge)

The BGAK PDU is used to acknowledge the acceptance of a layer 2 linksetup request from a peer.

c) BGREJ PDU (Begin Reject)

The BGREJ PDU is used to reject the layer 2 link setup request of thepeer LLC entity.

d) END PDU (END)

The END PDU is used to release an LLC link between two peer entities.

e) ENDAK PDU (END Acknowledge)

The ENDAK PDU is used to acknowledge the release of an LLC link.

f) RS PDU (Resynchronization)

The RS PDU is used to resynchronize the buffers and data transfer statevariables.

g) RSAK PDU (Resynchronization Acknowledge)

The RSAK PDU is used to acknowledge the acceptance of aresynchronization requested by the peer LLC entity.

h) ER PDU (Error Recovery)

The ER PDU is used to recover from protocol error.

i) ERAK PDU (Error Recovery Acknowledge)

The ERAK PDU is used to acknowledge the recovery from protocol error.

j) SD PDU (Sequenced Data)

The SD PDU is used to transfer, through an LLC link, sequentiallynumbered PDUs containing information fields provided by the LLC user.

k) POLL PDU (Status Request)

The POLL PDU is used to request, across an LLC link, to transmit statusinformation about the peer LLC entity.

l) STAT PDU (Solicited States Response)

The STAT PDU is used to respond to a status request (POLL PDU) receivedfrom a peer LLC entity. It contains information regarding the receptionstatus of SD PDUs and SD-with-POLL PDUs in the N(R) field, creditinformation for the peer transmitter in the N(R) field, and the sequencenumber in the N(PS) field corresponding to the POLL PDU or SD-with-POLLPDU to which it is in response.

m) USTAT PDU (Unsolicited States Response)

The USTAT PDU is used to respond to a detection of one or more newmissing SD PDUs, based on the examination of the sequence number of theSD PDU. It contains information regarding the reception status of SDPDUs in the N(R) field, and an upper-window-edge information for thepeer transmitter in the N(MR) field.

n) SD-with-POLL PDU (Sequenced Data with Status Request)

The SD-with-POLL PDU is used to transfer, through an LLC link,sequentially numbered PDUs containing information fields provided by theLLC user and used to request status information about the peer LLCentity.

o) UD PDU (Unnumbered Data PDU)

The UD PDU is used for unassured data transfer between two LLC users.When an LLC user requests unacknowledged information transfer, the UDPDU is used to send information to the peer without affecting LLC statesor variables. The UD PDUs does not carry a sequence number andtherefore, the UD PDU may be lost without notification.

p) MD PDU (Management Data PDU)

The MD PDU is used for transferring unassured management data betweentwo management entities. When a management entity requestsunacknowledged information transfer, the MD PDU is used to sendinformation to the peer management entity without affecting LLC statesor variables. The MD PDU does not carry a sequence number and therefore,the MD PDU may be lost without notification.

An invalid PDU is a PDU which:

a) has an unknown PDU type code, or

b) is not of the proper length of the PDU belonging to the stated types.

Invalid PDUs shall be discarded without notification to the sender. Noadditional action is taken as a result of the invalid PDU. Lengthviolations from items b) and c) above are reported to layer management.

2.5.2.3.3.1.2.2 Formats of LLC PDUs

FIGS. 72 through 88 represents formats of LLC PDUs. As listed at section2.5.2.3.3.1.2.1, there are 16 types of PDUs.

FIG. 72 represents the sequenced data PDU (SD PDU). FIG. 73 representsthe sequenced-data-with-status-re quest PDU (SD-with-POLL PDU). FIG. 74represents the POLL PDU. FIG. 75 represents the STAT PDU. FIG. 76represents the USTAT PDU. FIG. 77 represents the UD PDU and MD PDU. FIG.78 represents the Begin PDU (BGN PDU). FIG. 79 represents the BGAK PDU.FIG. 80 represents the BGREJ PDU. FIG. 81 represents the END PDU. FIG.82 represents the ENDAK PDU. FIG. 83 represents the RS PDU. FIG. 84represents the RSAK PDU. FIG. 85 represents the ER PDU. FIG. 86represents the ERAK PDU. Features of these formats will be describedbelow.

2.5.2.3.3.1.2.2.1 Coding Conventions

The coding of the LLC PDU conforms to the coding conventions specifiedin 2.1/I.361 [4]. LLC PDU is trailer oriented: i.e., the protocolcontrol information is transmitted last.

2.5.2.3.3.1.2.2.2 Reserved Field

There is a field of reserved bits (that may be refried to as R, Rsvd,Reserved) in each PDU. One function of the reserved field is to achievethe eight-bit alignment of PDU. Other functions should be studiedfurther. When no functions other than the eight-bit-alignment aredefined, this field shall be coded as zero. This field shall be ignoredby the receiver.

2.5.2.3.3.1.2.2.3 PDU Length

The maximum length of the information fields in SD, UD, and MD PDUs is koctets. The maximum value of k should be studied further. The value of kis determined at part of size negotiation procedures carried out outsideLLC, upon bilateral agreement, and may be specified by anotherRecommendation utilizing LLC, or may be derived from the maximum lengthPDU size for protocols using LLC. The minimum value of k is 0 octets.

The maximum length of a variable length SSCOP-UU field is j octets. Themaximum value of j should be studied further. The value of j isdetermined upon bilateral agreement, may be specified by anotherRecommendation utilizing LLC, or may be derived from requirements ofprotocols utilizing LLC. The minimum value of j is 0 octets.

2.5.2.3.3.1.2.2.4 Codings of STAT and USTAT PDU

Each USTAT PDU contains two list elements. Each STAT PDU contains zeroor more list elements. Transmitted STAT messages may be segmented intotwo or more STAT PDUs.

The processing of a STAT PDU does not rely on information in other STATPDUs. This is true even for the case when multiple STAT PDUs aregenerated in response to a single POLL PDU, and one or more of thesePDUs are lost.

The span list items in the STAT and USTAT PDUs are odd or even elementsof a list used for selective retransmission requests. Every odd elementrepresents the first PDU of a missing gap, and every even element,except possibly the last one, represents the first PDU of a receivedsequence.

2.5.2.3.3.1.2.2.5 States of LLC Protocol Entity

This sub-clause describes the states of an LLC entity. These states areused in the specification of the peer-to-peer protocol. The states areconceptual and reflect general conditions of the LLC entity in thesequences of signals and PDU exchanges with its user and peer,respectively. In addition, other conditions are used in the description,in order to avoid identification of additional states, as detailed inthe SDLs. The basic states will be described below.

State 1 (Idle)

Each LLC entity is conceptually initiated in an Idle state (state 1) andreturns to this state upon the release of a connection.

State 2 (Outgoing Connection Pending)

An LLC entity requesting a connection with a peer is in an outgoingconnection pending state (state 2) until it receives an acknowledgementfrom the peer.

State 3 (Incoming Connection Pending)

An LLC entity that has received a connection request from a peer and iswaiting for its user's response is in an incoming connection pending(state 3).

State 4 (Outgoing Disconnection Pending)

An LLC entity requesting release of the peer-to-peer connection is in anoutgoing disconnection pending state (state 4) until it receives aconfirmation that the peer entity has released and transitioned to theIdle state (State 1).

State 5 (Outgoing Resynchronization Pending)

An LLC entity requesting resynchronization of the connection with a peeris in an outgoing resynchronization pending state (state 5).

State 6 (Incoming Resynchronization Pending)

An LLC entity that has received a resynchronization request from a peerand is waiting for its user's response is in an incomingresynchronization pending state (state 5).

State 7 (Outgoing Recovery Pending)

An LLC entity requesting recovery of an existing connection with a peeris in an outgoing recovery pending state (state 7).

State 8 (Recovery Response Pending)

An LLC entity that has completed recovery, notified its user of therecovery completion, and is awaiting for a response from the user is ina recovery response pending state (state 8).

State 9 (Incoming Recovery Pending)

An LLC entity that has received a recovery request from a peer and iswaiting for its user's response is in an incoming recovery pending state(state 9).

State 10 (Data Transfer Ready)

Upon successful completion of the connection establishment,resynchronization, or error recovery procedures, both peer LLC entitieswill be in a data transfer ready state (state 10) and possible toexecute data transfer.

2.5.2.3.3.1.2.4 LLC State Variables

This section describes the state variables used in the peer-to-peerprotocol. SD and POLL PDUs are sequentially and independently numbered,and may have a value between “0” and n minus 1 (where n is the modulusof the sequence number). The modulus equals to 2⁸, and therefore, thesequence number cycles through the entire range between 0 through2^(8—1). Therefore, all arithmetic operations on the following statevariables or sequence numbers are affected by the modulus: VT(S),VT(PS), VT(A), VT(PA), VT(MS), VR(R), VR(H), and VR(MR). When performingarithmetic comparisons of transmitter variables, VT(A) is assumed as abase. When performing arithmetic comparisons of receiver variables,VR(R) is assumed as a base. In addition, the state variables VT(SQ) andVR(SQ) use the modulo 256 arithmetic. The LLC sub-sub-layer manages thefollowing state variables at the transmitter.

a) VT(S)-Sending State Variable

This is the sequence number of an SD PDU to be transmitted next in thefirst transmission (i.e. except for that in retransmissions). This isincremented after sending each SD PDU in the first transmission (i.e.except in retransmissions).

b) VT(PS)-Poll Sending State Variable

This is the sequence number of a POLL PDU or SD-with-POLL PDUtransmitted currently. This is incremented before transmission of thenext POLL or SD-with-POLL PDU.

c) VT(A)-Acknowledgement State Variable

This is the sequence number of an in-sequence SD PDU which is expectedto be acknowledged next and forms the lower edge of an acknowledgementwindow acknowledging SD PDUs. The variable VT(A) is updated in responseto the acknowledgement of transmitted SD PDUs.

d) VT(PA)-Poll Acknowledgement State Variable

This is the sequence number of an STAT PDU which is expected to bereceived next and forms the lower edge of the acknowledgement windowconstituted of STAT PDUs. If an STAT PDU containing an invalid parameterat the N(PS) field is received, a recovery is initiated or release isperformed. Otherwise, if an acceptable STAT PDU is received, thevariable VT(PA) is updated on the basis of the parameter at the N(PS)field of the received STAT PDU.

e) VT(MS)-Maximum Sendable Value State Variable

This is the sequence number of an SD PDU which is not allowed by thepeer receiver. That is, the peer receiver sequentially receives SD PDUshaving sequence numbers up to VT(MS)-1. The variable VT(MS) representsthe upper edge of the transmission window. The transmitter should nottransmit a new SD PDU if the current VT(S) reaches VT(MS). The variableVT(MS) is updated in response to the reception of a USTAT PDU, STAT PDU,BGN PDU, BGAK PDU, RS PDU, RSAK PDU, ER PDU, or ERAK PDU.

f) VT(PD)-Poll Data State Variable

When acknowledgements are outstanding, this state variable representsthe number of SD PDUs transmitted between transmissions of two POLLPDUs, or the number of SD PDUs transmitted before the transmission ofthe first POLL PDU after a POLL timer became active. The variable VT(PD)is incremented in response to the transmission of an SD PDU, and resetto zero in response to the transmission of a POLL PDU.

g) VT(CC)-Connection Control State Variable

This variable represents the number of unacknowledged BGN, END, ER, orRS PDUs. The variable VT(CC) is incremented in response to thetransmission of a BGN, END, ER, or RS PDU. If an END PDU is transmittedin response to a protocol error, LLC sub-sub-layer does not wait forreceiving the corresponding ENDAK PDU and enters directly into state 1(Idle) and the variable VT(CC) is not incremented

h) VT(SQ)-Transmitter Connection Sequence State Variable

This state variable is used to allow the receiver to identifyretransmitted BGN, ER, and RS PDUs. This state variable is initializedto “0” in response to creation of the LLC process and incremented andthen mapped into the N(SQ) field of a BGN, RS, or ER PDU before theinitial transmission of the BGN, RS, or ER PDU as represented in FIGS.78, 83 and 85.

Additionally, the LLC sub-sub-layer manages the following statevariables at the receiver.

a) VR(R)-Reception State Variable

This state variable is the sequence number of an in-sequence SD PDUexpected to be received next. This variable is incremented in responseto the reception of the next SD PDU.

b) VR(H)-Highest Expected Reception State Variable

This state variable is the highest number among sequence numbers ofin-sequence SD PDUs in a transmission window expected to be receivednext. The variable VR(H) may be updated in response to the reception ofa new SD PDU or in response to the reception of a POLL PDU.

c) VR(MR)-Maximum Receivable Value State Variable

This is the sequence number of an SD PDU which is not allowed by thereceiver. That is, the receiver sequentially receives SD PDUs havingsequence numbers up to VR(MR)-1. The receiver should discard the SD PDUhaving the parameter in the N(S) field being equal to or more thanVR(MR). It is possible that the reception of such an SD PDU causes thetransmission of a USTAT PDU. Updating manner of the variable VR(MR) canbe optional with the device, but the variable VR(MR) should not be lessthan VR(H).

d) VR(SQ)-Receiver Connection Sequence State Variable

This state variable is used to identify retransmitted BGN, ER, and RSPDUs. In reaction to the reception of a BGN, ER, or RS PDU, this statevariable is compared with the value in the N(SQ) field of the receivedBGN, ER, or RS PDU, and then the value in the N(SQ) field is allocatedto the variable VR(SQ). In the comparison, if they are different, thePDU is processed and the variable VR(SQ) is set to the parameter in theN(SQ) field. If they are equal to each other, the PDU is identified as aretransmitted one.

2.5.2.3.3.1.2.5 LLC PDU Parameter Fields

a) N(S)

The variable VT(S) is mapped to the N(S) field of a new SD,SD-with-POLL, or POLL PDU whenever the new SD, SD-with-POLL, or POLL PDUis generated as represented in FIGS. 72-74.

b) Information Field

The information field of an SD, SD-with-POLL, MD, or UD PDU representedin FIGS. 72, 73, or 77 is mapped from the “message unit” parameter of anAA-DATA, MAA-UNITDATA, or AA-UNITDATA request. Afterward, theinformation in this field is mapped again to a “message unit” parameterof an corresponding AA-DATA, MAA-UNITDATA, or AA-UNITDATA indication.

c) N(PS)

After the variable VT(PS) has been incremented, the variable VT(PS) ismapped to the N(PS) field of an SD-with-POLL or POLL PDU whenever theSD-with-POLL or POLL PDU is generated as represented in FIGS. 73 and 74.In addition, the receiver of an SD-with-POLL or POLL PDU maps thecontents of the N(PS) field of the received SD-with-POLL or POLL PDUinto the N(PS) field of an STAT PDU as represented in FIG. 75. Tofacilitate error recovery procedures, in addition to the mapping of thevariable VT(PS) into the N(PS) field of the SD-with-POLL or POLL PDU,the SD-with-POLL or POLL PDU including the N(PS) field is stored in thetransmitter buffer whenever the PDU is sent.

d) N(R)

The variable VR(R) is mapped to the N(R) field of a STAT or USTAT PDUwhenever the STAT or USTAT PDU is generated as represented in FIGS. 75and 76.

e) N(MR)

The variable VR(MR) is mapped to the N(MR) field of an STAT, USTAT, RS,RSAK, ER, ERAK, BGN, or BGAK PDU whenever such a PDU is generated asrepresented in FIGS. 75, 76, 78, 79, 83, 84, 85, and 86. This variableis the basis for credit granting by the receiver.

f) SSCOP-UU

The SSCOP-UU in a BGN, BGAK, BGREJ, END or RS PDU in FIGS. 78-81, and 83is mapped to and from the “SSCOP-LU” parameter of the correspondingSSCOP signal.

g) SOURCE BIT (S)

In an END PDU, the source bit (S) field in FIG. 81 conveys informationas to whether the originator of the release initiation was the SSCOPuser or the SSCOP itself. When the transmission of an END PDU isinitiated by the user, this bit is set to “0.” However, when thetransmission of an END PDU is initiated by the SSCOP, this bit is set to“1.” This bit is mapped into the “source” field of an AA-RELEASEindication.

h) N(SQ)

This field carries the connection sequence value. The variable VT(SQ) ismapped to the N(SQ) field of a new BGN, RS, or ER PDU whenever the newBGN, RS, or ER PDU is transmitted. The parameter in this field is usedby the receiver with the variable VR(SQ) to identify retransmitted BGN,RS, and ER PDUs.

i) PDU Type Field

Codings with respect to the PDU type field is represented in the listformed by FIGS. 559 and 560.

2.5.2.3.3.1.2.6 LLC Timer

Description with respect to the LLC timer will be omitted.

2.5.2.3.3.1.2.7 LLC Protocol Parameters

LLC protocol parameters will be described below.

a) Max-CC

This is the maximum number of the state variable VT(CC) and correspondsto the maximum limit of transmissions of a BGN, END, ER, or RS PDU.

b) Max-PD

This is the maximum number of the state variable VT(PD) before sending aPOLL PDU and resetting VT(PD) to zero.

c) Max-STAT

This is the maximum number of list elements which can be contained in anSTAT PDU. When the number of list items exceeds the Max-STAT, the STATmessage shall be segmented. All of the PDUs carrying the segments madefrom an STAT message, except possibly the last one, contain Max-STATlist items. This parameter is not used for length check by the receiverof an STAT PDU, but is only used by the sender of the STAT message forsegmentation purposes. This parameter should be an odd integer greaterthan or equal to 3. The default value of the Max-STAT should be studiedfurther. This parameter can be changed dependently on the device.

The default value causes the STAT PDU to fill six ATM cells using AALtype 5 common part. In addition, the total length of a STAT PDU shouldnot exceed the maximum length of an SD PDU.

d) Clear-Buffers

This parameter is set upon connection establishment. It holds one of twovalues indicating “Yes” or “No,” respectively. If this parameter is setto “Yes,” the LLC sub-sub-layer can clear its transmission buffer andrelease transmission queue in response to a connection release. If thisparameter is set to “No,” the LLC sub-sub-layer can not clear itstransmission buffer and release transmission queue even if connectionrelease occurs. Additionally, if this parameter is set to “No,” the LLCsub-sub-layer cannot clear selectively acknowledged messages from itstransmission buffer if older ones are still outstanding.

e) Credit

This parameter is used to coodinate credit notifications to layermanagement. When the LLC sub-sub-layer is blocked from transmitting anew SD or SD-with-POLL PDU due to insufficient credit, the creditparameter is assigned the value indicating “No.” When the LLCsub-sub-layer is permitted to transmit a new SD or SD-with-POLL PDU, thecredit parameter is assigned to the value indicating “Yes.” The creditparameter is initially assigned “Yes.”

2.5.2.3.3.1.2.8 LLC Credit and Flow Control

2.5.2.3.3.1.2.8.1 Credit and Peer-to-Peer Flow Control

Credit is granted by the LLC receiver to allow the peer LLC transmitterto transmit new SD or SD-with-POLL PDUs. The process by which a receiverentity determined credit is optional, but is related to the bufferavailability and the bandwidth and delay of the connection.

The variable VR(MR) is contained in the N(MR) field of each of BGN,BGAK, RS, RSAK, ER, ERAK, STAT and USTAT PDUs sent by the receiver, andthen conveyed to the transmitter. The content of the N(MR) field is readout and stored as the variable VT(MS) at the transmitter. The variableVR(MR) sent to the transmitter is the sequence number of SD orSD-with-POLL PDU that the receiver will not accept.

The transmitter does not transmit any SD or SD-with-POLL PDU having thesequence number which exceeds the credit allowed. The receiver discardsany SD or SD-with-POLL PDUs having the sequence number which exceeds thecredit allowed. In one case, reception of such an SD or SD-with-POLL PDUmay cause the transmission of a USTAT PDU.

Previously granted credit can be reduced in order for the receiver toperform flow control, but the receiver credit variable VR(MR) cannot bereduced below the variable VR(H). In other words, if a receiver hasaccepted and acknowledged the receipt of the SD or SD-with-POLL PDUhaving the sequence number which is VR(H)-1, the credit value VR(MR)must be greater than or equal to VR(H).

The lower bound of the operating window according to the LLC protocol isthe variable VT(A) while the upper bound thereof is VT(MS)-1. Themodulus of the protocol limits the sequence number range of theoperating window to 2⁸—1. Therefore, the acceptable sequence number(granted credit) at the receiver by the modulo arithmetic must be avalue between VR(H) and VR(R)-1. If VR(MR)=VR(R)=VR(H), the operatingwindow size is zero. If VR(MR)=VR(R)-1, the operating window size ismaximum.

The LLC receiver allocates a buffer to support each connection. Inprinciple, the available receiver buffer should match or exceed thecredit granted to the transmitter to avoid the discard of successfullytransmitted data. However, if limitted buffers are availabled for aconnection, it is possible to grant credit in excess of the availablebuffer capacity. This method may obtain a higher throughput than can beachieved by limiting the credit to the availed buffer, with thepossibility that data may need to be discarded if errors occur. Thereceiver cannot discard previously received and acknowledged, but notyet delivered, SD or SD-with-POLL PDUs. In addition, the receiver mustallocate sufficient buffer capacity to receive and deliver the SD orSD-with-POLL PDU with the sequence number which is equal to VR(R) at alltimes unless VR(R)=VR(H)=VR(MR). The granting of credit in excess ofbuffer capacity should only be performed if limited buffers areavailable to support the connection and if the LLC receiver can stillmaintain the quality of service (QOS) required for the connectionthrough this method.

2.5.2.3.3.1.2.8.2 Local Flow Control

LLC events, such as receptions of PDUs and external and internalsignals, are normally processed in the order in which they occurred.However, events pertaining to the exchange of LLC link statusinformation have priority over other data transfer.

A device may detect congestion (for example, a long queuing delay) inits lower protocol layers. In this case, data transfer should besuspended in order to give priority to connection control messages. Themeans, by which an LLC entity decides whether or not congestion occurs,depends on the protocol environment, including protocol timer values.

If an LLC entity detects a local congestion (“lower layer busy”), it canelect to suspend the servicing AA-DATA request signals, AA-UNITDATArequest signals, and MAA-UNITDATA request signals. It can also suspendthe retransmission of requested SD or SD-with-POLL PDUs. The datatransfer procedures allow this to occur without causing protocol errors.

Therefore, when transmitting PDUs to the peer receiver, all types ofPDUs except for SD PDU, SD-with-POLL PDU, MD PDU, and UD PDU are givenhighest priority. The SD PDUs, SD-with-POLL PDUs, MD PDUs, and UD PDUshave equal priority. Retransmissions of SD PDUs have priority over newtransmissions of SD PDUs if both PDU types are pending. These prioritiesare only internal to the LLC. The LLC's local flow control at user'sinterface is dependent on the device.

2.5.2.3.3.2. Format and Parameters of MAC PDU in MAC Sub-Layer and FrameFormats and Parameters on Logical Channels

In the following, the format and parameters of an MAC PDU in the MACsub-layer and frame formats and parameters on logical channels will bedescribed with reference to FIGS. 87-94. FIG. 87 represents the frameformat of an MDU and the frame format on the broadcasting channel(BCCH). FIG. 88 represents the frame format of an MDU and the frameformat on the perch channel (PCH). FIG. 89 represents the frame formatof an MDU and the format of long and short frame on the random accesschannel (RACH). FIG. 90 represents the frame format of an MDU and theformat of long frame on the forward access channel (FACH). FIG. 91represents the frame format of an MDU and the format of short frame onthe forward access channel (FACH). FIG. 92 represents the frame formatof an MDU and the frame format on the stand alone dedicated controlchannel (SDCCH). FIG. 93 represents the frame format of an MDU and theframe format on the associated control channel (ACCH). FIG. 94represents the frame format of an MDU and the frame format on the userpacket channel (UPCH).

a) PAD

A PAD field is included in an MAC PDU (MAC sub-layer frame) to extendthe length of the MAC PDU to an integer multiple of the length of alayer 1 frame (extend to integer octets). The bit or all bits in the PADfield should be “0.”

b) Length

A length field is interposed in the MAC PDU for indicating the amount ofthe MAC PDU including the PAD field by the octet.

c) CRC

A CRC field including an error detection code is attached to each MACPDU, so that the receiver can detect any errors. The result should beused for a determination by a higher layer protocol as to whether theframe should be retransmitted. FIG. 561 represents the relationshipbetween the length of CRC fields and channels through whichcorresponding frame is transmitted.

d) ST

A segment type (ST) field is included in each layer 1 frame forindicating that the corresponding layer 1 frame is the top, middle, orend of the original MAC PDU. The segment type is attached when an MACPDU is disassembled to layer 1 frames, and referred when an MAC PDUevaluation is assembled from the layer 1 frames. FIG. 562 represents thebit coding of the ST field and the meaning thereof.

e) Others

A BI field in the layer 1 frame in FIG. 89 includes a BCCH identity (BI)information. FIG. 563 represents the bit coding of the BI field and themeaning thereof.

An SFN field in the layer 1 frame in FIG. 89 includes a system framenumber (SFN) used for retrieval of the uplink long code phase and forsynchronization of the super-frames.

An uplink interference field in the layer 1 frame in FIG. 89 includesuplink interference information indicating the uplink interference levelfor the corresponding sector measured most recently. FIG. 564 representsthe bit coding of the uplink interference field and the meaning thereof.However, when the measurement has not been carried out, all of the bitsin the uplink interference field should be one.

A PID field in the layer 1 frame in either of FIGS. 89 and 90 includes apersonal identification (PID) of message or mobile station which isidentified on the RACH or FACH. The identification shall be of thelength of 16 bits. FIG. 565 represents the relationship between theusage of the PID field and the range of PID value.

A U/C field in the layer 1 frame on the RACH, FACH or UPCH representedin either of FIGS. 89-91, and 94 includes an identifier for indicatingthat either of user information or control information is included inthe layer 1 frame. FIG. 566 represents the bit coding of the U/C fieldand the meaning thereof.

A TN field in the layer 1 frame on the RACH, FACH, or UPCH representedin either of FIGS. 89-91, and 94 includes an identifier of thetermination or inception. FIG. 567 represents the bit coding of the TNfield and the meanings thereof.

An MO field in the short layer 1 frame on the FACH represented in FIG.91 includes a bit for identifying the mode of the FACH. FIG. 568represents the bit coding of the MO field and the meanings thereof.

A CRC field including an error detection code is attached to each layer1 frame as represented in FIGS. 87 through 94, so that the receiver candetect any errors. FIG. 569 represents the relationship between thelength of CRC fields and channels through which corresponding frames aretransmitted.

An S field is attached to the short layer 1 frame on the RACH asrepresented in FIG. 89. When an MAC PDU evaluation is assembled from theshort layer 1 frames on the RACH, the bit in the S field contributes toprevent the same layer 1 frame from duplicating in the MAC PDU.

A TA field in the layer 1 frames represented in either of FIGS. 87through 94 includes tail bits as a convolutional code.

A D field represented in either of FIGS. 90 through 92 contains dummybits.

2.5.2.4 Layer 3 Messages

Next, messages of layer 3 of the invented system will be described. Inthe following description, ITU-T Recommendations X, I, and Q series willbe sometimes shortened to X, I, and Q.

2.5.2.4.1 Protocol Architecture

First, the protocol architecture of layer 3 will be described. FIG. 95is a conceptual diagram representing an example of the radio interfaceprotocol architecture. Among the protocol control entities in FIG. 95,CC (call/connection control) entity complies with Q.2931 and controlscall and connection. MM-P entity complies with Q.2932 and managesmobility services for users, e.g., user authentication. MM-T (terminalmobility management) entity manages mobility services for mobileterminals, e.g., terminal location registration and user authentication.RRC (radio resource control) entity treats initiations for allocationand reservation of radio resources and for activation and deactivationof handover. TAC (terminal association control) entity establishes andreleases signaling connections between mobile terminals and the network.

2.5.2.4.2 Message Formats

Next, message formats for layer 3 will be described.

2.5.2.4.2.1 Formats of CC Entity Messages

First, CC (call/connection control) entity messages will be described.FIG. 570 is a list representing various messages belonging to the CCentity message. In the following, the messages represented in FIG. 570will be described with reference to lists in FIGS. 571 through 628. Inthe lists, “M” means mandatory information element while “O” meansoptional information element. “OF” means information element that willbe used when ATM (asynchronous transfer mode) will be applied to radiotransmission.

2.5.2.4.2.1.1 Alerting Message

First, an alerting message will be described. The alerting message istransferred from a called user to the network and then transferred fromthe network to a calling user in order to indicate that callingprocedure of the called user is started. FIG. 571 through 573 form alist representing information elements constituting the alertingmessage. As represented in this list, the significance of the alertingmessage is global, the channel on which the alerting message is carriedis the ACCH, and the direction is both.

In the list formed by FIG. 571, the connection identifier, narrow-bandbearer capability information element, narrow-band high layercompatibility information element, mobile bearer capability informationelement, and mobile high layer information element should be studiedfurther. The broad-band higher layer information element is included ifthe higher layer information selection procedure is used. The mobilebearer capability information element will be used when bearercapability is selected.

2.5.2.4.2.1.2 Call Proceeding Message

Next, a call proceeding message will be described. The call proceedingmessage is transferred from the network to a calling user or from acalled user to the network in order to indicate that requested callsetup is initiated and no additional call setup will be accepted. FIG.574 through 576 form a list representing information elementsconstituting the call proceeding message. As represented in this list,the significance of the call proceeding message is global, the channelon which the call proceeding message is carried is the SDCCH or ACCH,and the direction is both.

2.5.2.4.2.1.3 Connect Message

Next, a connect message will be described. The connect message istransferred from a called user to the network and from the network to acalling user in order to indicate that requested call is accepted by thecalled user. FIG. 577 through 581 form a list representing informationelements constituting the connect message. As represented in this list,the significance of the connect message is global; the channel on whichthe connect message is carried is the ACCH, and the direction is both.

As represented in this list, if the called user wants to reply thecalling user the broadband low layer compatibility information, thebroadband low layer compatibility information element is included in theconnect message from the called user to the network. If the connectmessage from the called user to the network includes the broadband lowlayer compatibility information element, the broadband low layercompatibility information element is also included in the connectmessage from the network to the calling user. For the broadband lowlayer information negotiation, this information element is included inthe connect message as an option, but some network may not transfer thisinformation element to the calling user.

2.5.2.4.2.1.4 Connect Acknowledge Message

Next, a connect acknowledge message will be described. The connectacknowledge message is transferred from the network to a called user inorder to indicate that the call is established for the called user. Inaddition, the connect acknowledge message is transferred from a callinguser to the network in order to enable symmetric call control procedure.FIG. 582 is a list representing information elements constituting theconnect acknowledge message. As represented in this list, thesignificance of the connect acknowledge message is local, the channel onwhich the connect acknowledge message is carried is the ACCH, and thedirection is both.

The notification identifier information element is included if thenotification procedure is applied. A plurality of notificationidentifier information elements can be included in this message. Themaximum length and the allowable number of the elements depend on thenetwork.

2.5.2.4.2.1.5 Progress Message

Next, a progress message will be described. The progress message istransferred from the network or either of users in order to indicate theevent as a call progress when the interworking is taken place. FIGS. 583through 585 form a list representing information elements constitutingthe progress message. As represented in this list, the significance ofthe progress message is global, the channel on which the connect messageis carried is the SDCCH or ACCH, and the direction is both.

2.5.2.4.2.1.6 Setup Message

Next, a setup message will be described. The setup message istransferred from a calling user to the network and from the network to acalled user in order to initiate a call setup. FIGS. 586 through 594form a list representing information elements constituting the setupmessage. As represented in this list, the significance of the setupmessage is global, the channel on which the setup message is carried isthe SDCCH or ACCH, and the direction is both.

2.5.2.4.2.1.7 Release Message

Next, a release message will be described. The release message istransferred from the network or either of users in order to initiatethat the device transmitting the release message has disconnected theFPLMTS connection for releasing connection identifier (if connectionidentifier is used) and call reference. The device which has receivedthe release message should release the connection identifier, transmit arelease complete message, and then release the call reference. The abovedescription about the connection identifier will be valid only when theATM will be applied on air interface in the future. FIG. 595 is a listrepresenting information elements constituting the release message. Asrepresented in this list, the significance of the release message isglobal, the channel on which the release message is carried is the SDCCHor ACCH, and the direction is both.

2.5.2.4.2.1.8 Release Complete Message

Next, a release complete message will be described. The release completemessage is transferred from the network or either of users in order toinitiate that the device transmitting the release complete message hasreleased the connection identifier (if connection identifier is used)and call reference. The connection identifier can be reused byreleasing. The device which has received the release complete messageshould release the call reference. The above description about theconnection identifier will be valid only when the ATM will be applied onair interface in the future. FIG. 596 is a list representing informationelements constituting the release complete message. As represented inthis list, the significance of the release complete message is local,the channel on which the release complete message is carried is theSDCCH or ACCH, and the direction is both.

2.5.2.4.2.1.9 Information Message

Next, an information message will be described. The information messageis transferred from the network or either of users in order to provideadditional information, more specifically, additional information forcall setup (e.g., overlap sending) or various information related tocall. FIG. 597 is a list representing information elements constitutingthe information message. As represented in this list, the significanceof the information message is local (however, information with globalsignificance can be transferred by this message), the channel on whichthe information message is carried is the SDCCH or ACCH, and thedirection is both.

2.5.2.4.2.2 Format of MM-T Entity Message

Next, MM-T (terminal mobility management) entity message will bedescribed.

2.5.2.4.2.2.1 Message Belonging to MM-T Entity Message

FIG. 598 is a list representing a message (mobility facility message)belonging to the MM-T entity message.

With respect to various messages including the mobility facility messageand others, discrimination can be carried out by the message typeinformation element. That is, if more significant three bits in themessage type information element are “011,” the corresponding messagebelongs to messages prescribed in Q.2931. In addition, if the lesssignificant five bits are “00010,” the corresponding message belongs tomessages prescribed in Q.2932. Otherwise, the corresponding message isthe mobility facility message.

2.5.2.4.2.2.2 Mobility Facility Message

FIG. 599 is a list representing the generic formats of the mobilityfacility message. As represented in this list, the significance of themobility facility message is local, and the direction is both.

2.5.2.4.2.2.3 Facility

The facility information of the mobility facility message in FIG. 599 isconstituted of various information elements in fact. The contents of thefacility information vary with the usage of the corresponding mobilityfacility message. Thus, lists of information elements of mobilityfacility message for various utilization will be explained.

(a) Mobility Facility Message from MS to Network for Terminal LocationRegistration

FIGS. 600 and 601 form a list representing information elementsconstituting a mobility facility message transferred from the mobilestation to the network for requesting terminal location registrationwhen the terminal location should be updated or when the mobile stationroams. As represented in the list, the protocol discriminator in thismessage indicates MM-T, the channel on which this message is carried isthe SDCCH, and the direction is from MCF of the mobile station to SACFof the network.

(b) Mobility Facility Message from Network to MS for Terminal LocationRegistration

When the terminal location should be updated or when the mobile stationroams, another type of mobility facility message (as a response messageto the request of terminal location registration) is transferred fromthe network to the mobile station. This response message can beclassified into three sorts represented in three lists of FIGS. 602through 604, respectively. As generically represented in those lists,the protocol discriminator in each of these messages indicates MM-T, thechannel on which each message is carried is the SDCCH, and the directionis from SACF of the network to MCF of the mobile station.

(b-1) Response Message Indicating “Return Result”

When the terminal location has been normally registered, the mobilityfacility message (response message) indicating “return result”represented in FIG. 602 is sent.

(b-2) Response Message Indicating “Return Error”

When an abnormality, for example, an application error has occurred, themobility facility message (response message) indicating “return error”represented in FIG. 603 is sent.

(b-3) Response Message Indicating “Reject”

When an abnormality, for example, a discrepancy of an informationelement has occurred, the mobility facility message (response message)indicating “return error” represented in FIG. 604 is sent.

(c) Mobility Facility Message from Network to MS for TMUI Assignment

FIG. 605 is a list representing information elements constituting amobility facility message transferred from the network to the mobilestation for notifying the mobile station of the TMUI allocated to themobile station. As represented in the list, the protocol discriminatorin this message indicates MM-T, the channel on which this message iscarried is the SDCCH, and the direction is from SACF and TACF of thenetwork to MCF and TACAF of the mobile station.

(d) Mobility Facility Message from MS to Network for TMUI Assignment

Another type of mobility facility message (as a response message to theTMUI assignment) is transferred from the mobile station to the network.This response message can be classified into three sorts represented inthree lists of FIGS. 606 through 608, respectively. As genericallyrepresented in those lists, the protocol discriminator in each of thesemessages indicates MM-T, the channel on which each message is carried isthe SDCCH, and the direction is from MCF and TACAF of the mobile stationto SACF and TACF of the network.

(d-1) Response Message Indicating “Return Result”

When the TMUI has been normally assigned, the mobility facility message(response message) indicating “return result” represented in FIG. 606 issent.

(d-2) Response Message Indicating “Return Error”

When an abnormality, for example, an application error has occurred, themobility facility message (response message) indicating “return error”represented in FIG. 607 is sent.

(d-3) Response Message Indicating “Reject”

When an abnormality, for example, a discrepancy of an informationelement has occurred, the mobility facility message (response message)indicating “return error” represented in FIG. 608 is sent.

(e) Mobility Facility Message from Network to MS for AuthenticationChallenge

FIGS. 609 and 610 form a list representing information elementsconstituting a mobility facility message transferred from the network tothe mobile station for authenticating the mobile station by the mobileservice switching center. As represented in the list, the protocoldiscriminator in this message indicates MM-T, the channel on which thismessage is carried is the SDCCH or ACCH, and the direction is from SACFand TACF of the network to MCF and TACAF of the mobile station.

(f) Mobility Facility Message from MS to Network for AuthenticationChallenge

Another type of mobility facility message (as a response message to theauthentication challenge) is transferred from the mobile station to thenetwork. This response message can be classified into three sortsrepresented in three lists of FIGS. 611 through 613, respectively. Asgenerically represented in those lists, the protocol discriminator ineach of these messages indicates MM-T, the channel on which each messageis carried is the SDCCH or ACCH, and the direction is from MCF and TACAFof the mobile station to SACF and TACF of the network.

(f-1) Response Message Indicating “Return Result”

When the authentication has been normally requested, the mobilityfacility message (response message) indicating “return result”represented in FIG. 611 is sent.

(f-2) Response Message Indicating “Return Error”

When an abnormality, for example, an application error has occurred, themobility facility message (response message) indicating “return error”represented in FIG. 612 is sent.

(f-3) Response Message Indicating “Reject”

When an abnormality, for example, a discrepancy of an informationelement has occurred, the mobility facility message (response message)indicating “return error” represented in FIG. 613 is sent.

(g) Mobility Facility Message from Network to MS for Ciphering StartNotification

FIG. 614 is a list representing information elements constituting amobility facility message transferred from the network to the mobilestation for notifying the mobile station of ciphering onset. Asrepresented in the list, the protocol discriminator in this messageindicates MM-T, the channel on which this message is carried is theSDCCH or ACCH, and the direction is from SACF and TACF of the network toMCF and TACAF of the mobile station.

(h) Mobility Facility Message from MS to Network for Ciphering StartNotification

Another type of mobility facility message (as a response message to theciphering start notification) is transferred from the mobile station tothe network. This response message can be classified into three sortsrepresented in three lists of FIGS. 615 through 617, respectively. Asgenerically represented in those lists, the protocol discriminator ineach of these messages indicates MM-T, the channel on which each messageis carried is the SDCCH or ACCH, and the direction is from MCF and TACAFof the mobile station to SACF and TACF of the network.

(h-1) Response Message Indicating “Return Result”

When the ciphering onset has been normally notified, the mobilityfacility message (response message) indicating “return result”represented in FIG. 615 is sent.

(h-2) Response Message Indicating “Return Error”

When an abnormality, for example, an application error has occurred, themobility facility message (response message) indicating “return error”represented in FIG. 616 is sent.

(h-3) Response Message Indicating “Reject”

When an abnormality, for example, a discrepancy of an informationelement has occurred, the mobility facility message (response message)indicating “return error” represented in FIG. 617 is sent.

(i) Mobility Facility Message from Network to MS for IMUI Retrieval

FIG. 618 is a list representing information elements constituting amobility facility message transferred from the network to the mobilestation for inquiring of the mobile station as to the IMUI of the mobilestation. As represented in the list, the protocol discriminator in thismessage indicates MM-T, the channel on which this message is carried isthe SDCCH, and the direction is from SACF and TACF of the network to MCFand TACAF of the mobile station.

(j) Mobility Facility Message from MS to Network for IMUI Retrieval

Another type of mobility facility message (as a response message to theIMUI inquiry) is transferred from the mobile station to the mobileservice switching center. This response message can be classified intothree sorts represented in three lists of FIGS. 619 through 621,respectively. As generically represented in those lists, the protocoldiscriminator in each of these messages indicates MM-T, the channel onwhich each message is carried is the SDCCH, and the direction is fromMCF and TACAF of the mobile station to SACF and TACF of the network.

(j-1) Response Message Indicating “Return Result”

When the IMUI has been normally inquired, the mobility facility message(response message) indicating “return result” represented in FIG. 619 issent.

(j-2) Response Message Indicating “Return Error”

When an abnormality, for example, an application error has occurred, themobility facility message (response message) indicating “return error”represented in FIG. 620 is sent.

(j-3) Response Message Indicating “Reject”

When an abnormality, for example, a discrepancy of an informationelement has occurred, the mobility facility message (response message)indicating “return error” represented in FIG. 621 is sent.

2.5.2.4.2.3 Format of RBC Entity Message

Next, RBC (radio bearer control) entity message will be described.

2.5.2.4.2.3.1 Messages Belonging to RBC Entity Message

FIG. 622 is a list representing messages belonging to the RBC entitymessage.

2.5.2.4.2.3.2 Classification of RBC Entity Message

RBC entity message can be classified into two types: one relates tosetup and release of bearer so as to cause an RBC ID to change; and theother relates to maintain bearer so as not to cause an RBC ID to change.FIG. 623 is a list representing the classification of RBC entitymessage.

2.5.2.4.2.3.3.1 Basic Message Format

Next, the basic format of RBC entity message will be described. Each EBCentity message comprises a fundamental part and an optional extensionalpart. The fundamental part is constituted of one or moremessage-specific-parameter fields and one or more optional fundamentalinformation fields. FIG. 96 represents the basic format of RBC entitymessage.

Message-specific-parameter field in FIG. 96 contains at least one uniqueparameter of the message.

Each fundamental information field includes at least one parameter inconformance with the procedure that the message initiates. In otherwords, fundamental information elements in RBC entity messages vary withthe necessary procedure. Fundamental information field can be usedwithout any design change of the invented system.

On the contrary, extensional information field may be used if theperformance of the invented system is extended.

Operation indicator field asterisked in FIG. 96 is not included in theRBC entity message for the invented system. If a new type of messagewill be used in the system due to performance extension in the future,this field will be used.

2.5.2.4.2.3.3.2 Structures of Frames of RBC Entity Message

FIG. 97 represents structures of frames of an RBC entity message. Asrepresented in FIG. 97, message-specific-parameter field is mandatory.As to each parameter, if the length is variable, the length fieldindicates that there is no instruction. As to each parameter, if thereis not a parameter that may be used optionally, this fact is indicatedby a bit or bits for indicating whether there is a parameter or not.

2.5.2.4.2.3.4 Specific Message Formats

Next, specific formats of various messages belonging to RBC entitymessage will be described.

2.5.2.4.2.3.4.1 Radio Bearer Setup Message

First, radio bearer setup message will be described. This message issent from the network to a mobile station in order to setup a radiobearer therebetween. FIG. 624 is a list representing the format of radiobearer setup message. The protocol discriminator of the messageindicates RBC, the channel on which the message is carried is the SDCCHor ACCH, and the direction is from the network to the mobile station.

2.5.2.4.2.3.4.2 Radio Bearer Release Message

This message is sent from the network to a mobile station or from amobile station to the network in order to release a radio bearertherebetween. FIG. 625 is a list representing the format of radio bearerrelease message. The protocol discriminator of the message indicatesRBC, the channel on which the message is carried is the ACCH, and thedirection is from the network to the mobile station or from the mobilestation to the network.

2.5.2.4.2.3.4.3 Radio Bearer Release Complete Message

This message is sent from the network to a mobile station or from amobile station to the network in order to notify of the releasecompletion of a radio bearer therebetween. FIG. 626 is a listrepresenting the format of radio bearer release complete message. Theprotocol discriminator of the message indicates RBC, the channel onwhich the message is carried is the ACCH, and the direction is from thenetwork to the mobile station or from the mobile station to the network.

2.5.2.4.2.3.4.4 Handover Command Message

This message is sent from the network to a mobile station in order toindicate the radio bearer therebetween that is added, deleted, replaced,or substituted at handover. FIG. 627 is a list representing the formatof handover command message. The protocol discriminator of the messageindicates RBC, the channel on which the message is carried is the ACCH,and the direction is from the network to the mobile station.

2.5.2.4.2.3.4.4 Handover Response Message

This message is sent to respond to a handover command massage, thehandover command message initiating diversity handover (DHO) branchdeletion, DHO branch addition, code replacement, and any combinationthereof. FIG. 628 is a list representing the format of handover responsemessage. The protocol discriminator of the message indicates RBC, thechannel on which the message is carried is the ACCH, and the directionis from the mobile station to the network.

2.5.2.4.2.4 Format of RRC Entity Message

Next, RRC (radio resource control) entity message will be described.

2.5.2.4.2.4.1 Message Belonging to RRC Entity Message

FIG. 629 is a list representing a message (radio resource facilitymessage) belonging to the RRC entity message. Utilization of the ROSE(remote operations service element) protocol as the protocol for the RRCentity should be studied further. Therefore, this description is basedon the ROSE protocol.

2.5.2.4.2.4.2 RRC Entity Message Format

2.5.2.4.2.4.2.1 Mobility Facility Message

FIG. 630 is a list representing the format of the RRC facility messagesent from a mobile station to the network for initiating the RRCprocedure. As represented in this list, the protocol discriminator ofthe message indicates RRC, the channel on which the message is carriedis the SDCCH or ACCH, and the direction is from the mobile station tothe network.

2.5.2.4.2.5 TAC Entity Messages

Next, TAC (terminal association control) entity messages will bedescribed. FIG. 631 is a list representing TAC entity messages. FIG. 632is a list representing the relationship between TAC entity message andinformation flow. The messages will be explained in detail.

2.5.2.4.2.5.1 Terminal Association Setup Message

This message is sent from a mobile station to the network to indicatethe start of the terminal association. FIG. 633 is a list representingthe format of the terminal association setup message. The protocoldiscriminator of the message indicates TAC, the channel on which themessage is carried is the SDCCH, and the direction is from TACAF of themobile station to TACF of the network.

2.5.2.4.2.5.2 Terminal Association Connect Message

This message is sent from the network to the mobile station to respondto the terminal association setup message for notifying of the requestedterminal association can be achieved normally. FIG. 634 is a listrepresenting the format of the terminal association connect message. Theprotocol discriminator of the message indicates TAC, the channel onwhich the message is carried is the SDCCH, and the direction is fromTACF of the network to TACAF of the mobile station.

2.5.2.4.2.5.3 Paging Response Message

This message is sent from a mobile station to the network to respond topaging. FIG. 635 is a list representing the format of the pagingresponse message. The protocol discriminator of the message indicatesTAC, the channel on which the message is carried is the SDCCH, and thedirection is from TACAF of the mobile station to TACF of the network.

2.5.2.4.2.5.4 Terminal Association Release Message

This message is sent from the network to the mobile station or from themobile station to the network in order to request to release theterminal association therebetween. FIG. 636 is a list representing theformat of the terminal association release message. The protocoldiscriminator of the message indicates TAC, the channel on which themessage is carried is the SDCCH or ACCH, and the direction is from TACFof the network to TACAF of the mobile station and from TACAF of themobile station to TACF of the network.

2.5.2.4.2.5.5 Terminal Association Release Complete Message

This message is sent from the network to the mobile station or from themobile station to the network in order to respond to the terminalassociation release message. FIG. 637 is a list representing the formatof the terminal association release complete message. The protocoldiscriminator of the message indicates TAC, the channel on which themessage is carried is the SDCCH or ACCH, and the direction is from TACFof the network to TACAF of the mobile station and from TACAF of themobile station to TACF of the network.

2.5.2.4.2.5.6 Page Authorized Message

This message is sent from the network to the mobile station to notifythat the terminals have been associated. FIG. 638 is a list representingthe format of the page authorized message. The protocol discriminator ofthe message indicates TAC, the channel on which the message is carriedis the SDCCH or ACCH, and the direction is from TACF of the network toTACAF of the mobile station.

2.5.2.4.2.6 Other Messages

In the following, other layer 3 messages which are carried on RACH,FACH, BCCH, and PCH will be described.

2.5.2.4.2.6.1 Signaling Channel Setup Request Message

This message is sent from a mobile station to a base transceiver system(BTS) in order to request to setup an SDCCH therebetween. FIG. 639 is alist representing the format of the signaling channel setup requestmessage. The channel on which the message is carried is the RACH, andthe direction is from SCMAF of the mobile station to SCMF of the BTS.

Signaling channel setup request messages from mobile stations whichrandomly access the BTS can be identified by PIDs (personalidentifications) corresponding to the mobile stations. As describedabove, a PID is a random number originally determined by thecorresponding mobile station and is included in a layer 1 frame.

2.5.2.4.2.6.2 Signaling Channel Setup Response Message

A signaling channel setup response message is sent from a BTS to amobile station in order to setup an SDCCH therebetween. FIG. 640 is alist representing the format of the signaling channel setup responsemessage. The channel on which the message is carried is the FACH, andthe direction is from SCMF of the BTS to SCMAF of the mobile station.Signaling channel setup response messages to mobile stations can beidentified by PIDs at the mobile stations.

A signaling channel setup failure message is sent from a BTS to a mobilestation in order to notify of rejection of the request to setup an SDCCHtherebetween. FIG. 641 is a list representing the format of thesignaling channel setup failure message. The channel on which themessage is carried is the FACH, and the direction is from SCMF of theBTS to SCMAF of the mobile station. Signaling channel setup failuremessages to mobile stations can be identified by PIDs at the mobilestations.

2.5.2.4.2.6.3 Broadcast Information Messages

A first broadcast information message is sent from a BTS to mobilestations in order to notify of various information, e.g., controlchannel structure information, information regarding mobile stationdecision of visited zone, and restriction information. FIG. 642 is alist representing the format of the first broadcast information message.The channel on which the message is carried is the BCCH, and thedirection is from BCFr of the BTS to each BCAF of mobile station.

A second broadcast information message is sent from a BTS to mobilestations in order to notify of call acceptance information. FIG. 643 isa list representing the format of the second broadcast informationmessage. The channel on which the message is carried is the BCCH, andthe direction is from BCFr of the BTS to each BCAF of mobile station.

2.5.2.4.2.6.4 Paging Message

This message is sent from a BTS to mobile stations in order to page tonotify of a first calling a specific mobile station. FIG. 644 is a listrepresenting the format of the paging message. The protocoldiscriminator of the message indicates TAC, the channel on which themessage is carried is the PCH, and the direction is from BCFr of thenetwork to each TACAF of mobile station.

The paged MS ID in the list indicates the TMUI or IMUI of the pagedmobile station. At the top of the paged MS ID field, an I/T bit isarranged for indicating that either of IMUI and TMUI is used.

The maximum length of the paging message is 112 bits. Coding manner ofthe paged MS ID asterisked in the list should be studied further. Evenwhen IMUI is used for the paged MS ID, it is unnecessary to indicate allbits of IMUI by the paged MS ID since lower bits of the UMUI can berecognized from the PCHs calculation number.

2.5.2.4.3 Formats of Information Elements in Messages

Next, formats of information elements in the aforementioned messageswill be described.

2.5.2.4.3.1 Formats of Information Elements in CC Entity Messages

2.5.2.4.3.1.1 Common Information Elements in CC Entity Messages

First, information elements which are common in CC entity messages willbe described. Each of CC entity protocol messages may comprise:

(a) protocol discriminator,

(b) call reference,

(c) message type identifier, including a message compatibilityinstruction indicator, and

(d) variable length information elements if necessary. Informationelements (a), (b), (c), and (d) are included in each of CC entityprotocol messages commonly, as represented in FIG. 98. However, variablelength information elements differ with message types. Informationelements (a), (b), and (c) are arranged in the order represented in FIG.98.

2.5.2.4.3.1.1.1 Protocol Discriminator

Protocol discriminator will be described next. The protocoldiscriminator is designed for distinguishing the CC entity message fromother messages in the invented system. In addition, the protocoldiscriminator is used for distinguishing the message in the inventedsystem from other messages prepared from OSI network layer protocol dataunit encoded in compliance with other ITU-T recommendations, TTCstandard or other standards.

The protocol discriminator is arranged at the top of each CC entitymessage as represented in FIG. 98. The protocol discriminator is ofeight-bit length as represented in FIG. 99 and encoded in a mannerrepresented in FIG. 645.

In the invented system, the CC entity messages does not use the samesignaling virtual channel as that of another layer 3 protocol message.Therefore, the encoding manners of the protocol discriminator aredifferent. However, if the other layer 3 protocol message is capsuledaccording to ITU-T Recommendation Q.2931, this message forms anexception.

The values in FIG. 645 are reserved for distinguishing the protocoldiscriminator from the first octet of a packet, including a generalformat discriminator, according to ITU-T Recommendation X.25.

2.5.2.4.3.1.1.2 Call Reference

Call reference is designed for identifying in a local user-networkinterface a message involved in a single call and is not used at theterminal devices interconnected via B-ISDN (broadband aspects ofintegrated services digital network). The call reference is arranged atthe second part of each CC entity message and encoded in a mannerrepresented in FIG. 100. The entire length of the call referenceinformation element is one octet and the length is indicated by bits 1through 4.

As represented in FIG. 100, the call reference information elementincludes a call reference value and a call reference flag. The callreference value of which all bits are “zero” (see FIG. 100) is reservedfor a global call reference. The call reference value of which all bitsare “one” (see FIG. 101) is reserved for a dummy call reference.

The call reference value is allocated to a call by the calling user sideof a user-network interface. As a general rule, the sole call referencevalue is allocated to a call in a single signaling virtual channel bythe calling user side. The call reference value is allocated at callonset and maintained to be used throughout the call. After terminationof a call, the call reference value is released and may be allocated toanother call.

It is possible that both sides of a signaling virtual channel linkallocate the same call reference value to two calls, respectively, andthe same call reference value is used for two calls in a singlesignaling virtual channel. In order to avoid such a coincidence by awrong scenario, it is not desirable to reuse the released call referencevalue immediately after the release.

The call reference flag is restricted to have zero or one. The callreference flag identifies which side of the signaling virtual channelallocates the corresponding call reference. That is, with respect tomessages from the calling user to the called user, the call referenceflag is zero. With respect to messages from the called user to thecalling user, the call reference flag is one. Therefore, although thesame call reference value is simultaneously used for messages in twodirections, they can be distinguished from each other.

The call reference flag is also similarly used for a global callreference, for example, at the initial setup procedure. As mentionedabove, all bits of a global call reference value are zero (see FIG.100). The device, which has received a message including a global callreference, should interpret that this message is valid for all messageson the signaling virtual channel.

On the other hand, all bits of a dummy call reference value are one (seeFIG. 101). In the future, a dummy call reference value will be used fora specific additional service. The call reference flag is also similarlyused for a global call reference. Dummy call reference is not used inprocedures of the invented system, so that devices of the inventedsystem should discard a message including a dummy call reference.

2.5.2.4.3.1.2 Message Type Identifier

Next, message type identifier, including message compatibilityinstruction indicator, will be described.

The message type identifier is designed for identifying the function ofthe message transmitted. The message type identifier is arranged at thethird part of each CC entity message and encoded in a manner representedin FIGS. 102, 646, and 647. FIG. 102 is a diagram representing theformat of the message type identifier. FIGS. 646 and 647 form a tablerepresenting the coding of the message type identifier. As mentioned inFIG. 646, octet 1 of the message type identifier encoded as “00000000”is used for an escape code for a nationally specific message type. Inaddition, as mentioned in FIG. 646, octet 1 of the message typeidentifier encoded as “11111111” is reserved for extension for the casethat all other values have been used.

On the other hand, the message compatibility instruction indicator isused by the message source terminal for explicitly instructing peerentity operation at the message destination terminal. The format and thecoding manner of the message compatibility instruction indicator arerepresented in FIGS. 102 and 647. The message compatibility instructionindicator is valid only in the defined local interval. It is optionalfor the network to decide which value is set to the messagecompatibility instruction indicator of a message transmitted from thenetwork to a user terminal insofar as the coding is not prescribed byanother manner.

2.5.2.4.3.1.3 Variable Length Information Elements According to FPLMTS

Next, variable length information elements according to FPLMTS will bedescribed.

2.5.2.4.3.1.3.1 Coding

Coding of the variable length information elements of CC entity messageswill be described hereinafter. The coding was studied in order that thedevice which processes messages can detect information elementsnecessary for the process and can ignore other elements.

FIGS. 103 and 104 represent the formats of the variable lengthinformation elements according to FPLMTS. FIGS. 648 and 649 form a listrepresenting the coding of the variable length information elementsaccording to FPLMTS. Bit coding represented in FIGS. 103, 104, 648, and649 are reserved for the information elements that will be describedlater.

As mentioned in FIG. 104, information element identifier encoded as“11111111” is reserved for extension. If all other information elementidentifiers have been used, further 65536 information elements can beidentified by virtue of the extension.

In the CC entity message, variable length information elements can bearranged in random order, but the following constitutes exceptions.

(a) If the broadband repeat indicator information element is notincluded and the same kind of information elements is included, the samekind of information elements should be arranged in succession. However,this rule is not applied for broadband locking shift informationelements and broadband non-locking shift information elements.

(b) If the broadband repeat indicator information element is includedand the same kind of information elements is included, the followingrules will be applied.

The broadband repeat indicator information element should be arrangeddirectly before the first element among the same kind of informationelements.

The first element among the same kind of information elements, which isarranged directly after the broadband repeat indicator informationelement, should be interpreted to have the highest priority. The samekinds of information elements should be interpreted in such a mannerthat the element of higher priority is arranged ahead.

The information elements arranged after the broadband non-locking shiftinformation element should be processed as an information element in theapplication of the above-described rules.

Only one repetition of information element in the message with thebroadband repetition indicator information element will not beconsidered an error. That is, the broadband repetition indictor shouldbe ignored.

(c) If the broadband locking shift information element is used, the ruleshould be applied to all of the information elements after it. The orderof the information elements is prescribed by codes indicated in thebroadband locking shift information element.

(d) If the broadband non-locking shift information element is used, thebroadband non-locking shift information element should be arrangeddirectly before the information element which is subject of that.

If reserved bits are included in the description of the information usedin the invented system, all of the reserved bits should be set to zero.Although the reserved bits of a received information element are not setto zero, the process for the reserved bits is not carried out.

FIGS. 648 and 649 represent the coding manner of the information elementidentifier. The information element identifier includes an informationelement compatibility instruction indicator at octet 2 thereof asrepresented in FIG. 649. The information element compatibilityinstruction indicator is valid only in the defined local interval. It isoptional for the network to decide which value is set to the informationelement compatibility instruction indicator of a massage included in amessage transmitted from the network to a user terminal insofar as thecoding is not prescribed by another manner.

Octets 3 and 4 of the information element cooperate to indicate thelength of the information elements minus the total length of theinformation element identifier field, information element compatibilityinstruction indicator field, and information element length indicatorfield itself. For the information element length indicator, the numberof octets in the information element is encoded into a binary code. Theinformation element length indicator is of a fixed length of two octets.The coding manner of the information element length indicator shouldcomply with the coding rule of integer described in this section.

The invented system permits an information element, of which the contentis empty, to present. For example, it is possible that a setup messageincludes a called number information element of which the octet lengthis zero. In such cases, the receiving device treats in such a mannerthat the information element is not interpreted to be included.Similarly, the exclusion of an expected information element isinterpreted as an “empty information element” at processing. The “emptyinformation element” is the information element which has a (valid)information element identifier and is of a length of zero.

In addition, the following rules are applied to information elementcoding in the invented system.

(a) The variable length information element constitutes of a singleoctet or a group of octets. A number is allocated to each single octetor octet group for facilitating reference. The first number of the octetnumber indicates single octet or octet group.

(b) Each octet group is an independent unit in an information element.The format of octet group can be defined in the following fashion orother fashions.

(c) Octet groups are prepared by using any extension method. Anextension method wherein bit eight is used as the extension bit, and anoctet (N) will be extended to the next octets (Na, Nb, . . . ) ispreferable. For example, a method based on the below rule can beutilized.

Bit value, zero, indicates that the corresponding bit is not end. Bitvalue, one, indicates that the corresponding bit is end. If an octet(e.g., Nb) exists, preceding octets (N) and (Na) also exist.

Bit eight may be indicated in the descriptions in sections2.5.2.4.3.1.3.5, and so on.

“0/1 extension” is used when another octet will follow an octet andthese octets belong to the same octet group.

“1 extension” is used when another octet will follow an octet and theseoctets belong to the same octet group.

“0 extension” is used when another octet will absolutely follow an octetand these octets belong to the same octet group.

When a specification is added, an additional octet can be defined afterthe preceding last octet (In this case, the description of “1 extension”is changed to the description of “0/1 extension.” Therefore, devices onthe invented system should accept such an additional octet. However, itis unnecessary that each of the devices interprets the additional octetor functions in accordance that.

(d) In addition to the above-described extension method, the indicationof bits eight to one of octet (N) can be extended to the next octets(N.1) and (N.2).

(e) The extension methods (c) and (d) can be associated. However, theextension method (c) is of high priority. Accordingly, all of octets(Na, Nb . . . ) must precede octets (N.1, N.2 . . . ). This rule shouldbe applied to the case that octets (N.1, N.2, . . . ) are extended inaccordance with the extension method for octets (Na, Nb, . . . ). Thesame rule should be applied to the case that the extension method (d) isrepeated. That is, octets (N.1, N.2 . . . ) should precede octet (N.2).

(f) Optional octets are marked with asterisks.

(g) If an information element is assembled using subfield identifiers,these subfield identifiers are independent of position. In other words,it is unnecessary that they are aligned in a specific order.

However, it is impossible to repeat to use the extension method (c).That is, the extension method for octet 4a cannot be applied to theoctet which should become octet 4b. In addition, a protocol designershould pay attention for guaranteeing that the resulting coding leads asole interpretation although a plurality of extension methods are used.Furthermore, it is prescribed that the coding standard field is attachedto all information elements. The information element of which the codingstandard field is prescribed to “national standard” should be formattedin the same manner as the standard format of the invented system.

The following rules are applied to integer coding of ITU-TRecommendation Q.2931. When coding is not designated, the rules areapplied.

(a) When an integer is encoded to the length equal to or more than twooctets, the octet with a less octet number includes superior bits.Especially, the octet with the least octet number includes the MSB (mostsignificant bit) while the octet with the greatest octet number includesthe LSB (least significant bit).

(b) With reference to a field which is within an octet or constitutes apart of an octet, the following rules are applied.

A bit with a greater bit number constitutes a superior bit.

Especially, the bit with the greatest bit number indicates the MSB (mostsignificant bit).

Especially, the bit with the least bit number indicates the LSB (leastsignificant bit).

Bit coding is carried out from the bit with less bit number (fromright). That is, preceding parts of zero appear at the side of greaterbit number (left) in an octet or field.

(c) When integer values are expressed in fixed length octets, bit codingis carried out from the octet with greater octet number. That is,preceding zero parts appears at the side of less octet number.

(d) When integer values are expressed in variable length octets (e.g.,when bit 8 is used as an extension bit), coding shall be performed sothat it becomes the smallest number of octets. Octets, of which all thepreceding bits are “0,” do not exist.

2.5.2.4.3.1.2 Extension of Code Sets

Next, extension of code sets will be described. When the formatdescribed at section 2.5.2.4.3.1.3.1 is used, the information elementidentifier may take a plurality values.

Each of information element identifiers may be extended to eight codesets. To facilitate to shift from a code set to another code set, acommon information element identifier is used for these code sets. Basedon the contents of the shift information element, the code set used forthe next-coming information element group or information element can beidentified. The code set used at an arbitrary given time is used as an“busy code set,” and code set 0 will be considered the initial busy codeset” implicitly. In addition, in the invented system, two code set shiftprocedures: locking shift and non-locking shift procedures are applied.

Reservation status of code sets will be noted in the following.

Code sets 1 through 3 are reserved for future use of ITU-T or TTC.

Code set 4 is reserved for standard use of ISO or IEC.

Code set 5 is reserved for an information element group utilizeddomestically.

Code set 6 is reserved for an information element group specialized forthe public or private network.

Code set 7 is reserved for an information element group specialized forusers.

In addition, the coding rules prescribed in section 2.5.2.4.3.1.3.1 willbe applied to information elements belonging to an arbitrary busy codeset.

Shift from busy code set to another code set (by locking shift) ispossible only when the value of new code set is higher than that of theformer code set.

When using non-locking shift procedure, the information elements in codesets 4, 5, 6 and 7 may appear together with one in the busy code set,i.e., code set 0 (see section 2.5.2.4.3.1.3.4).

The user or network device should have the ability to recognize bothlocking and non-locking shift information elements and determine thelength of information elements that follow them. The device, however,does not need to interpret or function according to the content of theseinformation elements. This enables the equipment to decide the startpoint of following information elements.

Code set 7 shall be processed in the first switching equipment in thelocal network in accordance with the unrecognized information elementprocessing procedure (see ITU-T Recommendation Q.2931) unless theservice definition in the future, agreement by both parties, orreadiness for special user support via the local network are provided.

Code set 6 is reserved for an information element group specialized forlocal networks (public or private networks). It is meaningless whenmessages are transmitted across the boundary between local networks andthe boundary between national or international networks. Therefore, theinformation element in code set 6 shall be processed in accordance withthe procedure for the information element which cannot be recognized bythe first switching equipment after the message is transmitted acrossthe boundary of the local network (see Section 5.6.8.1 of ITU-TRecommendation Q.2931) unless an agreement on two networks is concluded.

Code set 5 is reserved for an information element group utilizeddomestically. It is meaningless when messages are transmitted across theboundary between nations. Therefore, the information element in code set5 shall be processed in accordance with the procedure for theinformation element which cannot be recognized by the first switchingequipment after the message is transmitted across the boundary betweennations (see Section 5.6.8.1 of ITU-T Recommendation Q.2931) unless anagreement on two networks is concluded.

Code set 4 is reserved for standard use of ISO or IEC.

Code sets 1 through 3 are reserved for future use of ITU-T or TTC.

2.5.2.4.3.1.3.3 Broadband Locking Shift Procedure

Next, broadband locking shift procedure will be described. In thebroadband locking shift procedure, an information element is used toindicate a new busy code set. The indicated code set is continuouslyused until another broadband locking shift information element appearsto indicate the use of another code set. For example, presume that codeset 0 is “busy” at the start of analysis of message contents. Whenanother broadband locking shift information element appears to indicatethe use of code set 5, the information element identifier assigned bycode set 5 shall be applied to the next and following informationelements until another shift information element appears.

This procedure is used only for shifting from to a new code set of whichthe value is higher than the former code set, and relates to onlymessages including the broadband locking shift information elements. Theinitial busy code set at the start of analysis of message contents iscode set 0.

FIGS. 105 and 650 represent the coding format of the broadband lockingshift information element.

2.5.2.4.3.1.3.4 Broadband Non-Locking Shift Procedure

Next, broadband non-locking shift procedure will be described.

The broadband non-locking shift procedure is used for temporarilyshifting to a designated code set with lower or higher priority. In thebroadband non-locking shift procedure, a broadband non-locking shiftinformation element is used to indicate a busy code set whichcontributes for interpretation of the next single information element.After interpreting the next information element, the busy code set usedbefore non-locking shift shall be used again for interpreting arbitraryfollowing information elements. For example, assume that code set 0 isbusy at the start of analysis of message contents. When a broadbandnon-locking shift information element appears to indicate the use ofcode set 6, the information element identifier assigned by code set 6shall be applied only to the next information element. Afterinterpreting it, code set 0 shall be applied again to interpretfollowing information elements. The broadband non-locking shiftinformation element shall not be interpreted as an error even if itindicates the current code set.

A broadband locking shift information element cannot be arrangeddirectly after a broadband non-locking shift information element. Thereception of the combination thereof should be interpreted as that onlythe broadband locking shift information element is received.

FIGS. 106 and 651 represent the coding format of the broadbandnon-locking shift information element.

2.5.2.4.3.1.3.5 AAL Parameters

Next, AAL (ATM adaptation layer) parameters will be described. AALparameters are not necessary for the invented system, but it is possiblethat they are necessary when the ATM will be applied on air interface inthe future (this should be studied further).

AAL parameter information element is formulated to indicate AALparameters which are requested for an AAL procedure element used for acall and which are significant from end to end. This includes allparameters for the AAL sub-layer which can be selected by users. Thecontents of this information element are transparent to the networkexcept during interworking.

The AAL parameter information element should be coded as shown in FIGS.107 through 111 and 652 through 654. The maximum length of thisinformation element should be 21 octets.

In FIG. 108, the octets marked with “Note” are included only when octet7.1 indicates n×64 kbps or n×8 kbps. In FIGS. 109 and 110, theindication of octet groups 6 through 8 used in connect message isdesignated in ITU-T Recommendation Q.2931.

2.5.2.4.3.1.3.6 ATM Traffic Descriptor

Next, ATM traffic descriptor will be described. ATM traffic descriptoris not necessary for the invented system, but it is possible that thisis necessary when the ATM will be applied on air interface in the future(this should be studied further). ATM traffic descriptor is formulatedto indicate a traffic parameter set contributing to regulating thetraffic control capability.

In the invented system, the value of ATM peek cell rate (TTC StandardJT-371), which is indicated by the ATM traffic descriptor, designatesthe user plane information rate and total amount of the end-to-end OAM(operation, administration, and maintenance) F5 flows generated byusers. When the user attempts to use an end-to-end OAM F5 flow message,the peak cell rate in the direction reverse to unidirectional connectionshould not be indicated by zero. The peak cell rate is the number ofcells per second and is represented with an integer in the 3 octetspreceded by the sub-field.

The ATM traffic descriptor information element should be coded as shownin FIGS. 112 and 655. The maximum length of this information elementshould be 20 octets.

The peak cell rate of cells of which the CLP (cell loss priority) equalsto one is not represented in FIG. 112. However, if the peak cell rate ofcells of which the CLP equals to zero is indicated, the differencebetween the peak cell rate of cells of which the CLP equals to zero orone and the peak cell rate of cells of which the CLP equals to zeroshould be used as the peak cell rate of cells of which the CLP equals toone in the network resource allocation. However, if only the peak cellrate of cells of which the CLP equals to one or zero is indicated, acomplete peak cell rate should be used by cells with which the CLP isequal to zero.

2.5.2.4.3.1.3.7 Broadband Bearer Capability

Next, broadband bearer capability will be described. Broadband bearercapability is not a necessary parameter for the invented system, but itis possible that this is necessary when the ATM will be applied on airinterface in the future (this should be studied further).

The broadband bearer capability information element is formulated toindicate needed broadband connection-oriented-bearer service (see ITU-TRecommendation F.811), which are provided by the network. Therefore, thebroadband bearer capability information element is included in messagesused by the network. With reference to the use of the broadband bearercapability information element concerning confirming the communicationpossibility, refer to ITU-T Recommendation Q.2931.

The default for broadband bearer capability does not exist. Therefore,the broadband bearer capability information element can be processed bydevices of the network and user. The broadband bearer capabilityinformation element should be coded as shown in FIGS. 113 and 656. Themaximum length of this information element should be 7 octets.

The octet marked with “Note” in FIG. 113 can be included when octet 5indicates bearer class X.

2.5.2.4.3.1.3.8 Broadband High Layer Information (B-HLI)

Next, broadband high layer information will be described. Broadband highlayer information element is formulated to provide means for checkingcommunication capability of addressed entity (e.g., remote user andinterworking unit addressed by a calling user, and a higher layerfunction node of network). The broadband high layer information elementis carried transparently between a calling entity (e.g., calling user)and an addressed destination entity in B-ISDN.

The broadband high layer information element should be coded as shown inFIGS. 114 and 657. The maximum length of this information element shouldbe 13 octets.

2.5.2.4.3.1.3.9 Broadband Low Layer Information (B-LLI)

Broadband low layer information will be described next. Broadband lowlayer information element is formulated to provide means for checkingcommunication capability of addressed entity (e.g., remote user andinterworking unit addressed by a calling user, and a higher layerfunction node of network).

The broadband low layer information element is carried transparentlybetween a calling entity (e.g., calling user) and an addresseddestination entity in B-ISDN. The broadband low layer informationelement is also carried transparently from the addressed destinationentity to the calling entity for negotiation of broadband low layerinformation (refer to ITU-T Recommendation Q.2931).

The broadband low layer information element should be coded as shown inFIGS. 115, 116, 658 through 660. The maximum length of this informationelement should be 17 octets.

The octet marked with “Note 1” in FIG. 115 is included only when octet 6indicates the procedure of acknowledge type HDLC. The octet marked with“Note 2” exists only if octet 6 indicates the user-specific layer 2protocol. The octet marked with “Note 3” exists only if octet 7indicates the layer 3 protocol in accordance with the ITU-TRecommendation X.25, ISO/IEC 8208, ITU-T Recommendation X.223, orISO/IEC 8878 in FIGS. 658 through 660. The octet marked with “Note 4”exists only if octet 7 indicates the user-specific layer 3 protocol. Theoctets marked with “Note 5” exist only if octet 7 indicates ISO/IECTR9577.

2.5.2.4.3.1.3.11 Called Party Number

Called party number will be described next. Called party numberinformation element is formulated to indicate the called party. Thecalled party number information element should be coded as shown inFIGS. 117 and 661. The maximum length of this information element shoulddepend on the network.

In FIG. 117, the number digits appear in the same order as input,beginning from inferior four bits in octet 6. The digits are coded withBCD. When the use of NASP address is indicated in the address/numberingplan identification, the address shall be coded with the expression ofITU-T Recommendation X.213 or ISO/IEC8348.

Filler shall be “1111.”

2.5.2.4.3.1.3.12 Called Party Sub-Address

Called party sub-address will be described. Called party sub-addresselement is formulated to indicate the sub-address of the called party.With reference to the definition of sub-address, refer to ITU-TRecommendation I.330. The called party sub-address information elementshould be coded as shown in FIGS. 118 and 662. The maximum length ofthis information element should be 25 octets.

2.5.2.4.3.1.3.13 Calling Party Number

Calling party number will be described next. Calling party numberinformation element is formulated to indicate the calling party. Thecalling party number information element should be coded as shown inFIGS. 119, 663, and 664. The maximum length of this information elementshould depend on the network.

As marked with “Note 1” in FIG. 119, the number digits appear in thesame order as input, beginning from inferior four bits in octet 6. Thedigits are coded with BCD. When the use of NASP address is indicated inthe address/numbering plan identification, the address shall be codedwith the expression of ITU-T Recommendation X.213 or ISO/IEC8348 asmarked with “Note 2.” Filler shall be “1111.”

2.5.2.4.3.1.3.14 Calling Party Sub-Address

Calling party sub-address will be described. Calling party sub-addresselement is formulated to indicate the sub-address of the calling party.With reference to the definition of sub-address, refer to ITU-TRecommendation I.330. The calling party sub-address information elementshould be coded as shown in FIGS. 120 and 665. The maximum length ofthis information element should be 25 octets.

2.5.2.4.3.1.3.15 Cause

The definition and use of cause information element are defined in ITU-TRecommendation Q.2610.

2.5.2.4.3.1.3.16 Connection Identifier

Connection identifier will be described next. Connection identifier isnot necessary for the invented system, but it is possible that this isnecessary when the ATM will be applied on air interface in the future(this should be studied further). Connection identifier informationelement is formulated to indicate a local ATM connection resource on theinterface. This information element is included as an option in thesetup message and is included as an option in the first response messageto the setup message.

The connection identifier information element should be coded as shownin FIGS. 121 and 666. The maximum length of this information elementshould be 9 octets.

If the change addition indicator field designates an “arbitrary VCI,”the VCI field in FIG. 121 must be ignored. If the restart class is “001”(see ITU-T Recommendation Q.2931), the VCI field should be ignored. IfVP-associated signaling is designated in octet 5, the VPCI field must beignored.

2.5.2.4.3.1.3.17 End-to-End Transit Delay

End-to-end transit delay will be described. End-to-end transit delayinformation element is formulated to indicate the substantial maximumend-to-end transit delay permitted in each call and to indicate thecumulative transit delay expected in the virtual connection. Thistransit delay is the uni-directional end-to-end transit delay of userdata transferred during data transfer phase on the user plane betweenthe calling user and the called user. It includes the total process timein the end user system and the cumulative transfer delay. The totalprocess time in the end user system includes, e.g., process time, AALhandling delay, ATM cell assembly delay, and delay of all otherprocesses. The network transfer delay includes, e.g., propagation delay,ATM layer transfer delay, and all other process delay in the network.

The cumulative transit delay value indicated in the SETUP message by thecalling user (if any) indicates the transit delay from the calling userto the network boundary. The cumulative transit delay value, indicatedby the network, in the setup message sent to the called user is the sumof the value indicated by the UNI connected with the calling party andtransfer delay cumulated in the network. It does not include thetransfer delay in the route between the network boundary to the calleduser. Each of the cumulative transit delay in connection messages onboth UNIs is the total end-to-end transit delay expected for the userdata transfer on the virtual channel connection offered to thecorresponding call.

The maximum end-to-end transit delay can be used by the calling user toindicate the end-to-end delay request for the call. This field iscontained in the setup message by the network and used for indicatingthat the calling user instructs the end-to-end delay request to thecall. With reference to the applicable procedure, refer to ITU-TRecommendation Q.2931. The maximum end-to-end transit delay is notincluded in the connect message.

The end-to-end transit delay information element should be coded asshown in FIGS. 122 and 667. The maximum length of this informationelement should be 10 octets.

2.5.2.4.3.1.3.18 QOS Parameter

Quality of service (QOS) parameter will be described next. In theinvented system, QOS parameter information element is formulated inaddition to the end-to-end transit delay information element. The QOSparameter information element is designed to indicate a QOS class.

QOS parameter information element is not supported in B-ISUP Release 1.Consequently, a network cannot transmit the QOS parameter informationelement, and therefore, generates a default value of the QOS parameterinformation element, which does not indicate QOS class, at thetermination interface.

The QOS parameter information element should be coded as shown in FIGS.123 and 668. The maximum length of this information element should be 6octets.

2.5.2.4.3.1.3.19 Broadband Repeat Indicator

Broadband repeat indicator will be described next. Broadband repeatindicator information element is formulated to indicate how to interpreta plurality of the same kind of information elements which are includedin the same message. This is arranged before the first one of the samekind of information elements. However, even if the broadband repeatindicator is arranged before the information element solely included ina single message, this should not be interpreted as an error.

The broadband repeat indicator information element should be coded asshown in FIGS. 124 and 669. The maximum length of this informationelement should be 5 octets.

2.5.2.4.3.1.3.20 Restart Indicator

Restart indicator will be described next. Restart indicator should bedefined in detail in the future (this should be studied further).Restart indicator information element is formulated to identify afacility class which is initially designated.

2.5.2.4.3.1.3.21 Broadband Sending Complete

Broadband sending complete will be described next. Broadband sendingcomplete information element is formulated to indicate the completion ofthe called party number as an option (see ITU-T Recommendation Q.2931).This information element is mandatory for the batch mode procedure. Ifthis information element does not exist, however, the normal errorprocess for “mandatory information element missing” does not need to beperformed.

The broadband sending complete information element should be coded asshown in FIG. 125. The maximum length of this information element shouldbe 5 octets.

2.5.2.4.3.1.3.22 Transit Network Selection

Transit network selection will be described next. Transit networkselection information element is formulated to indicate a transitnetwork being requested. A plurality of transit network selectioninformation elements may be included in the same message for indicatingthe order of transit networks through which the call is transferred (seeITU-T Recommendation Q.2931).

The transit network selection information element should be coded asshown in FIGS. 126 and 670. The maximum length of this informationelement should depend on the network.

2.5.2.4.3.1.3.23 Notification Indicator

Notification indicator information element will be described next.Notification indicator information element is formulated to notify ofinformation related to the call. The notification indicator informationelement should be coded as shown in FIG. 127. The maximum length of thisinformation element is flexible as long as it does not contradict withthe maximum length of the message.

2.5.2.4.3.1.3.24 OAM Traffic Descriptor

OAM traffic descriptor will be described next. OAM traffic descriptor isnot necessary for the invented system, but it is possible that this isnecessary when the ATM will be applied on air interface in the future(this should be studied further). OAM traffic descriptor informationelement is formulated to provide information in relation to end-to-endOAM F5 information flow used to manage the performance on the userconnection included in the call, and failure caused by the user.

The OAM traffic descriptor information element should be coded as shownin FIGS. 128 and 671. The maximum length of this information elementshould be 6 octets.

2.5.2.4.3.1.4 Information Elements for Supporting 64 KBPS CircuitSwitched Mode ISDN Service

Next, information elements for supporting 64 kbps circuit switched modeISDN service will be described.

2.5.2.4.3.1.4.1 Coding Rules

First, coding rules of the information elements will be described. Theinformation elements which will be described in section 2.5.2.4.3.1.4are coded pursuant to the usual information element format representedin FIG. 103. The coding of these information elements should comply withthe coding rules in ITU-T Recommendation Q.931 and ITU-T RecommendationQ.2931.

2.5.2.4.3.1.4.2 Narrow-Band Bearer Capability

Narrow-band bearer capability will be described next. Narrow-band bearercapability is not necessary for the invented system, but it is possiblethat this is necessary when the ATM will be applied on air interface inthe future (this should be studied further). Narrow-band bearercapability information element is formulated to indicate a request fornarrow-band ISDN circuit switched mode bearer service provided by thenetwork. This information element includes only the information whichmay be used by the network (see ITU-T Recommendation Q.931). The usemethod of narrow-band bearer capability information element related tothe confirmation of communication feasibility is described in ITU-TRecommendation Q.931. The narrow-band bearer capability informationelement is transparently transferred in the broadband ISDN. Thenarrow-band bearer capability information element should be coded asshown in FIG. 129.

2.5.2.4.3.1.4.3 Narrow-Band High Layer Compatibility

Narrow-band high layer compatibility information element is formulatedto offer the procedure for the destination user to confirm thecommunication feasibility (see ITU-T Recommendation Q.931). Thenarrow-band high layer compatibility information element should be codedas shown in FIG. 130. The maximum length of this information elementshould be 7 octets.

However, the narrow-band high layer compatibility information element istransparently carried between the calling entity (e.g., calling user)and called entity (peer entity or higher later function node in thenetwork) addressed by the calling entity in the broadband ISDN. When itwas explicitly requested by the user upon subscription contract, thenetwork with the tele-service feature may analyze this information tooffer certain tele-service.

2.5.2.4.3.1.4.4 Narrow-Band Low Layer Compatibility

Narrow-band low layer compatibility will be described next. Narrow-bandlow layer compatibility information element is formulated to providemeans for confirming the feasibility with the entity whose address wasdesignated (e.g., remote user addressed by the calling user,interworking unit or higher layer function node of network).

The narrow-band low layer compatibility information element is carriedtransparently between the calling entity (e.g., calling user) and calledentity addressed by the calling entity in the broadband ISDN. Inaddition, the narrow-band low layer compatibility information element iscarried transparently from the called entity to the calling entity forthe narrow-band low layer compatibility negotiation (ITU-TRecommendation Q.931).

The narrow-band low layer compatibility information element should becoded as shown in FIG. 131. The maximum length of this informationelement should be 20 octets.

2.5.2.4.3.1.4.5 Progress Indicator

Progress indicator will be described next. Progress indicatorinformation element is formulated to indicate an event occurring duringcall generation. At most, two progress indicator elements are includedin the same message.

The progress indicator information element should be coded as shown inFIG. 132. The maximum length of this information element should be 6octets.

2.5.2.4.3.2 Formats of Information Elements in MM-T Entity Messages

Next, formats of information elements in MM-T entity messages will bedescribed. With reference to the list of MM-T specific informationelements in FIG. 672, the information elements will be described below.

(1) TMUI

TMUI is a temporary number for identifying a mobile station and isupdated at terminal location registration or updating. At callorigination and termination, the TMUI is not updated unless the networkrecognizes the TMUI disaccord.

FIG. 133 represents the format of TMUI information element. Asrepresented in FIG. 133, the TMUI information element consists of anM-SCP identification number (10 bits) and a unique identification number(20 bits plus 2 bits) and is encoded with the normal binary coding. Inthe unique identification number, two bits are allocated to doubleassignment evasion bits.

M-SCP identification number is used to identify the M-SCP which hasassigned the TMUI and takes a value between zero and 999. Uniqueidentification number is used to identify the mobile station in the nodewhich has assigned the TMUI and takes a value between zero and 999999.The double assignment evasion bits are used for evading doubleassignment of the same TMUI and takes a value between zero and three.

(2) TMUI Assignment Source ID

TMUI Assignment Source ID will be described next. As represented in FIG.134, TMUI assignment source ID consists of an MCC (mobile country code),MNC (mobile network code), and LAI and is encoded with the BCD in thesystem.

(3) IMUI

IMUI will be described next with reference to FIG. 135. IMUI is a numberfor recognition of a mobile station used in the network. IMUI includesan MCC and MNC, is of a variable length equal to or less than 15 places,and is encoded with BCD.

(4) Execution Authentication Type

Next, with reference to FIG. 136, execution authentication type will bedescribed. Execution authentication type is information for indicatingthe authentication procedure to be executed when a plurality ofauthentication procedures can be applicable for a mobile station.

(5) Authentication Random Pattern

Next, with reference to FIG. 137, authentication random pattern will bedescribed. Authentication random pattern indicates a random pattern forauthentication at a mobile station.

(6) Authentication Ciphering Pattern

Next, with reference to FIG. 138, authentication ciphering pattern willbe described. Authentication ciphering pattern indicates a cipheringpattern obtained by the mobile station on the basis of theauthentication random pattern.

(7) Execution Ciphering Type

Next, with reference to FIG. 139, execution ciphering type will bedescribed. Execution ciphering type is information to indicate theciphering procedure to be executed when a plurality of cipheringprocedures can be applicable for a mobile station.

(8) TC Information

Next, with reference to FIG. 140, TC information will be described. TCinformation is information used for identifying the type of mobilestation.

2.5.2.4.3.3 Information Elements of RBC Entity Messages

Information elements of RBC entity messages will be described next.

2.5.2.4.3.3.1 Message Type Identifier

As represented in FIG. 141, message type identifier is formulated toidentify the function of the corresponding transmitted message. Thisdoes not include an operation instruction indicator. The various typesof messages in FIG. 141 will be described later.

2.5.2.4.3.3.2 Information Element Identifier

Next, information element identifier will be described with reference toFIG. 142. Information element identifier identifies optional informationincluded in the corresponding message. When octet 1 of the identifier is“11111111,” octet 2 and following octets can be valid. Bit 8 of octet 2and following octets is used as an extension flag by which the nextoctet can be valid. No identifiers in relation to specific parametersare decided. The various types of messages in FIG. 142 will be describedlater.

2.5.2.4.3.3.3 Radio Bearer Setup Message Specific Parameter

FIG. 143 represents the format of radio bearer setup message specificparameter. In FIG. 143, RBC ID (RBC identifier) is a number foridentifying the RBC connection. The RBC connection uniquely correspondsto a connection which can be identified by a CR (call reference) andCONN ID (connection identifier) in the CC protocol. The CR is a callidentifier for the CC protocol (see section 2.5.2.4.3.1). The CONN ID isa connection identifier for the CC protocol (see section 2.5.2.4.3.1).

2.5.2.4.3.3.4 Radio Bearer Release Message Specific Parameter

FIG. 144 represents the format of radio bearer release message specificparameter. As represented in FIG. 144, radio bearer release messagespecific parameter consists of an RBC ID and cause indicator.

2.5.2.4.3.3.5 Radio Bearer Release Complete Message Specific Parameter

FIG. 145 represents the format of radio bearer release complete messagespecific parameter. As represented in FIG. 145, radio bearer releasecomplete message specific parameter consists of only an RBC ID.

2.5.2.4.3.3.6 Handover Command Message Specific Parameter

FIG. 146 represents the format of handover command message specificparameter. As represented in FIG. 146, handover command message specificparameter consists of only an invoke ID. The invoke ID is an identifyingnumber for associating a response signal with a handover command whenthe handover command has been initiated.

2.5.2.4.3.3.7 Handover Response Message Specific Parameter

FIG. 147 represents the format of handover response message specificparameter. As represented in FIG. 147, handover response messagespecific parameter consists of only an invoke ID.

2.5.2.4.3.3.8 Radio Bearer Setup Information Element

FIGS. 148 through 151 represent the format of radio bearer setupinformation. In FIG. 148, “information element identifier” indicates theradio bearer setup fundamental information element and has a length of 8bits. “Length” indicates the length of the information element.“Frequency band” field indicates the frequency band which should beindicated at the first call. 256 frequency bands can be indicated, i.e.,frequency band f1 is indicated by “00000000” in the “frequency band”,and frequency band f256 is indicated by “11111111.” “BTS number” fieldindicates the BTS identifying number in the network which is one ormore. “Sector number” field indicates the sector identifying number inthe same BTS, i.e., sector 1 is indicated by “00000001” while sector 12is indicated by “00001100.”

“Uplink short code type” field indicates the information transfer ratefor an uplink code (see FIG. 150). “Number of uplink codes” fieldindicates the number of uplink short codes between one and N when aplurality of uplink short codes are availed for a single connection.“Uplink short code number” field indicates the identifying number ofuplink short code between zero and 2047.

“Downlink short code type” field indicates the information transfer ratefor a downlink code (see FIG. 150). “Number of downlink codes” fieldindicates the number of downlink short codes between one and M when aplurality of downlink short codes are availed for a single connection.“Downlink short code number” field indicates the identifying number ofdownlink short code between zero and 2047.

“Frame offset group” field indicates which time slot in a single radioframe should be the front end of the logical frame when the mobilestation communicates. This is formulated to uniformize traffic in asingle frame time unit within the wired path. “Frame offset group” takesa value of 0-15 (see FIG. 151).

“Slot offset group” field indicates an offset value of downlinktransmission timing for a short code. The downlink transmission timingmay be offset by, at most, three subslots in order to reduce redundancyof pilot symbols. The indication by the “slot offset group” field at thefirst call should be contained until the release of all calls of themobile station (see FIG. 151).

2.5.2.4.3.3.9 DHO Branch Addition Information Element

FIGS. 152 through 154 represent the format of DHO (diversity handover)branch addition information element. In FIG. 152, “information elementidentifier” field is a length of eight bits and represents DHO branchaddition information element. “Number of RBC IDs” field indicates thenumber (from 1 to H) of the simultaneous connections. Other fields havebeen already described.

2.5.2.4.3.3.10 DHO Branch Deletion Information Element

FIG. 155 represents the format of DHO (diversity handover) branchdeletion information element. In FIG. 155, “information elementidentifier” field is a length of eight bits and represents DHO branchdeletion information element. Other fields have been already described.

2.5.2.4.3.3.11 ACCH Replacement Information Element

FIG. 156 represents the format of ACCH replacement information element.In FIG. 156, “information element identifier” field is a length of eightbits and represents ACCH replacement information element. Other fieldshave been already described.

2.5.2.4.3.3.12 Branch Replacement Information Element

FIGS. 157 through 159 represent the format of branch replacementinformation element. In FIG. 157, “information element identifier” fieldis a length of eight bits and represents branch replacement informationelement. Other fields have been already described.

2.5.2.4.3.3.13 User Rate Replacement Information Element

FIGS. 160 through 163 represent the format of user rate replacementinformation element. In FIG. 160, “information element identifier” fieldis a length of eight bits and represents user rate replacementinformation element. Other fields have been already described.

2.5.2.4.3.3.14 Code Replacement Information Element

FIGS. 164 and 165 represent the format of code replacement informationelement. In FIG. 164, “information element identifier” field is a lengthof eight bits and represents code replacement information element.“Number of former short codes” field indicates the number (from 1 to N)of former short codes used before the short code replacement orrearrangement procedure. “Former short code number” field indicates theidentifying number (from 0 to 2047) of former short code used before theshort code replacement or rearrangement procedure. “Number of new shortcodes” field indicates the number (from 1 to M) of new short codes afterthe short code replacement or rearrangement procedure. “New short codenumber” field indicates the identifying number (from 0 to 2047) of newshort code after the short code replacement or rearrangement procedure.Other fields have been already described.

2.5.2.4.3.4 Information Elements of RRC Entity Messages

Next, information elements of RRC entity messages will be described.

2.5.2.4.3.4.1 Message Type Identifier

Message type identifier will be described with reference to FIG. 166.Message type identifier is formulated for identifying the function ofthe message transmitted.

2.5.2.4.3.4.2 Facility Information Element

The format of facility information element is represented in FIG. 167.In FIG. 167, “profile” field indicates the type of PDU (protocol dataunit) which is contained in octet 4 and later octets, i.e., ROSEprotocol data unit, CMIP protocol data unit, or ACSE protocol data unit.“PDU” field includes one or more PDUs which are ASEs (applicationservice elements) identified by the “profile” field. In the inventedsystem, ROSE protocol is used.

2.5.2.4.3.4.3 ROSE PDU

FIGS. 168 and 169 represent the format of ROSE PDU. In FIG. 168,“component type tag” is mandatory for each component and indicates thetype of component (invoke, result return (termination), error return,rejection, result return (proceeding), and so on). “Component length”indicates the length of component excluding the lengths of componenttype tag field and component length field. “Invoke identifier tag” isused as a reference number for identifying the operation invoke, therebyassociating a request with a response. “Invoke identifier length”indicates the length of the “invoke identifier” field. “Invokeidentifier” indicates the invoke identifier. “Operation value tag” isincluded in the invoke component, and so on for indicating the type ofoperation (local operation or global operation) which should be invoked.“Operation value” indicates the type of information for defining theoperation, i.e., information on the candidate zones for call attempt oracceptance, on the in-use zone, on the added zone for DHO, on thedeleted zone for DHO, on the zone for HHO, on the outer loop, or on thequality deterioration notification.

2.5.2.4.3.4.4 Specific Parameters for Operations

Next, specific parameters for defining operations will be described.

(a) Candidate Zone Information for Call Attempt or Acceptance

First, specific parameters of the candidate zone information for callattempt or acceptance will be described. This information is sent fromthe mobile station to the network to notify the network of the radiowave reception conditions, measured by the mobile station at the callattempt or acceptance, with respect to the visited sector andcircumferential sectors. FIG. 673 represents parameters of the candidatezone information. Perch channel reception SIR and perch channeltransmission power in FIG. 673 are used for controlling downlinktransmission power.

(b) In-Use Zone Information

Next, specific parameters of the in-use zone information will bedescribed. This information is sent from the mobile station to thenetwork to initiate the downlink radio transmission power control basedon the radio wave reception condition, measured by the mobile station,with respect to the in-use sector. FIG. 674 represents parameters of thein-use zone information.

(c) Added Zone Information for DHO

Next, specific parameters of the added zone information for DHO will bedescribed. This information is invoked by the mobile station to causethe network to add one or more diversity links during communication, andincludes parameters on the candidate sector(s) to be added and radioreception conditions about the candidate sector and the in-use sector.FIG. 675 represents parameters of the added zone information for DHO.

Only the candidate sector about which the radio reception condition isin excess of a threshold for DHO branch addition is added. However, ifthe condition about the candidate sector is worse than conditions of allin-use sectors when the number of the in-use sectors is the maximum, theDHO trigger indicating the added zone information for DHO is not sent.

(d) Deleted Zone Information for DHO

Next, specific parameters of the deleted zone information for DHO willbe described. This information is invoked by the mobile station to causethe network to execute the diversity link deletion based on the radioreception condition about in-use sectors measured by the network. FIG.676 represents parameters of the deleted zone information for DHO.

The radio reception conditions about the in-use sectors are comparedwith a threshold for DHO branch deletion. Then, only the sector aboutwhich the radio reception condition is lower than the threshold for DHObranch deletion is deleted. On the contrary, this information is notsent for the sector which will be deleted instead of the sector added bythe DHO branch addition although the radio reception condition is notlower than the threshold.

(e) HHO (Hard Handover) Zone Information

Next, specific parameters of the HHO zone information will be described.This information is invoked by the mobile station to cause the networkto execute the branch replacement handover based on the radio receptionconditions about the in-use sector and circumferential sectors measuredby the network. FIG. 677 represents parameters of the HHO zoneinformation.

(f) Outer Loop Information

Next, specific parameters of the outer loop information will bedescribed. This information is invoked by the mobile station to causethe network to execute outer loop transmission power control for thedownlink radio channel. FIG. 678 represents parameters of the outer loopinformation.

(g) Quality Deterioration Notification Information

Next, specific parameters of the quality deterioration notificationinformation will be described. This information is invoked by the mobilestation to cause the network to execute the branch replacement whereinchannel is replaced to another channel with a different frequency whenthe mobile station detects quality deterioration with respect to thedownlink radio channel. FIG. 679 represents parameters of the qualitydeterioration notification information.

2.5.2.4.3.4.5 Definitions of Specific Parameters for Operations

Next, the definitions of the specific parameters for defining operationswill be described.

2.5.2.4.3.4.5.1 Number of Visited Candidate Sectors, Number of In-UseVisited Sectors, Number of Candidate Sectors to be Added at DHO, Numberof Sectors to be Deleted at DHO, and Candidate Sectors for HHO

FIG. 170 represents the common format of parameters of number of visitedcandidate sectors, number of in-use visited sectors, number of candidatesectors to be added at DHO, number of sectors to be deleted at DHO, andcandidate sectors for HHO. In FIG. 170, “number of sectors” fieldcontains a binary code representing a value between 1 and N.

2.5.2.4.3.4.5.2 BTS Number

FIG. 171 represents the format of a parameter of BTS number. “BTSidentifier” in FIG. 171 is a number more than one for identifying thecorresponding BTS in the network.

2.5.2.4.3.4.5.3 Sector Number

FIG. 172 represents the format of a parameter of sector number. “Sectoridentifier” in FIG. 172 is a value of 1-12 for identifying thecorresponding sector in the BTS.

2.5.2.4.3.4.5.4 Perch Channel Reception SIR

FIG. 173 represents the format of a parameter of perch channel receptionSIR. “Perch channel reception SIR” in FIG. 173 indicates the perchchannel reception SIR of the visited sector, circumferential sector, orin-use sector measured at the mobile station.

2.5.2.4.3.4.5.5 Perch Channel Transmission Power

FIG. 174 represents the format of a parameter of perch channeltransmission power.

2.5.2.4.3.4.5.6 Long Code Phase Difference

FIG. 175 represents the format of a parameter of long code phasedifference. “Long code phase difference” in FIG. 175 indicates thedifference between the long code phase of the visited or in-use sectorand that of a circumferential sector (to which the connection may behanded over). This is used when the execution of DHO and the zoneselection at call attempt or acceptance. If the difference is in excessof 128 chips, the field of long code phase difference should be extendedby setting the extension bit to 1.

2.5.2.4.3.4.5.7 Number of RBC IDs

FIG. 176 represents the format of a parameter of the number of RBC IDs.The “number of RBC IDs” field in FIG. 176 contains a binary coderepresenting a value between 1 and N.

2.5.2.4.3.4.5.8 RBC ID

FIG. 177 represents the format of a parameter of RBC ID. “RBC ID” inFIG. 177 is a number for identifying the RBC connection which uniquelycorresponds to a connection which can be identified by a CR (callreference) and CONN ID (connection identifier) in the CC protocol. Ittakes a value between 1 and H.

2.5.2.4.3.4.5.9 Necessary SIR

FIG. 178 represents the format of a parameter of necessary SIR.

2.5.2.4.3.4.5.10 FER Measurement

FIG. 179 represents the format of a parameter of FER measurement.

2.5.2.4.3.5 Formats of Information Elements of TAC (Terminal AssociationControl) Entity Messages

Next, formats of information elements of TAC entity messages will bedescribed.

2.5.2.4.3.5.1 General Description of TAC (Terminal Association Control)Entity Messages

Each TAC entity message may comprise:

(a) protocol discriminator,

(b) message type identifier,

(c) message specific parameter (if necessary),

(d) fundamental information element (if necessary), and

(e) extensional information element (if necessary).

Although elements (a) and (b) are included in all of the TAC entitymessages commonly, elements (c) through (d) may be included in specificmessages on demand.

FIG. 180 represents an example of TAC entity message. The first twoinformation elements (protocol discriminator and message typeidentifier) should appear in the order designated in FIG. 180.

2.5.2.4.3.5.2 Protocol Discriminator

First, the protocol discriminator will be described. The protocoldiscriminator is formulated to distinguish the TAC entity message fromother messages used in the invented system and from other OSI networklayer protocol unit messages encoded in accordance with another ITU-Trecommendation, TTC recommendation, and another recommendation. Theprotocol discriminator is located at the first part of each TAC entitymessage and encoded in the manner shown in FIG. 181.

2.5.2.4.3.5.3 Message Type Identifier (Including Message CompatibilityInstruction Indicator)

Next, the message type identifier will be described.

The message type identifier is formulated to identify the function ofthe TAC entity message. The message type identifier is located at thesecond part of each TAC entity message and encoded in the manner shownin FIGS. 182 and 680.

The message compatibility instruction indicator is valid only in thedefined local interval. It is optional for the network to decide whichvalue is set to the message compatibility instruction indicator of amessage transmitted from the network to a user terminal insofar as thecoding is not prescribed by another manner. In the invented system, itis encoded as “000.”

2.5.2.4.3.5.4 Message Specific Parameter

The message specific parameter is used for indicating specificinformation necessary for the message. This will be described in detailin the following.

2.5.2.4.3.5.4.1 TAC Entity Message Specific Parameters

FIG. 681 is a list representing the TAC entity message specificparameters.

(1) Terminal Association Setup Message Specific Parameter

The terminal association setup message specific parameter is encoded inthe manner represented in FIGS. 183 and 682.

(2) Paging Response Message Specific Parameter

The paging response message specific parameter is encoded in the mannerrepresented in FIGS. 184 and 683.

(3) Terminal Association Release Message Specific Parameter

The terminal association release message specific parameter is encodedin the manner represented in FIGS. 185 and 684.

2.5.2.4.3.5.4.2 Subfields of TAC Entity Message Specific Parameters

Next, subfields of TAC entity message specific parameters will bedescribed.

(1) Coding Rules

First, coding rules of subfields of TAC entity message specificparameters will be described. The coding of the subfields should complywith the coding rule which will be described below. These rules areformulated in order that devices which treats the TAC entity messagescan identify information elements that are necessary for procedures.FIG. 685 is a list representing information elements which may becontained in subfields of TAC entity message specific parameters. Forcoding integer values in subfields of TAC entity message specificparameters, the following rules should be applied.

(a) When an integer is encoded to the length equal to or more than twooctets, the octet with a less octet number includes superior bits.Especially, the octet with the least octet number includes the MSB (mostsignificant bit) while the octet with the greatest octet number includesthe LSB (least significant bit).

(b) With reference to a field which is within an octet or constitutes apart of an octet, the following rules are applied.

A bit with a greater bit number constitutes a superior bit.

Especially, the bit with the greatest bit number indicates the MSB (mostsignificant bit).

Especially, the bit with the least bit number indicates the LSB (leastsignificant bit).

Bit coding is carried out from the bit with less bit number (fromright). That is, preceding parts of zero appear at the side of greaterbit number (left) in an octet or field.

(c) When integer values are expressed in fixed length octets, bit codingis carried out from the octet with greater octet number. That is,preceding zero parts appears at the side of less octet number.

(d) When integer values are expressed in variable length octets, codingshall be performed so that it becomes the smallest number of octets.Octets, of which all the preceding bits are “0,” do not exist.

(2) Cause Information Element

The cause information element is used for indicating the cause ofrelease of terminal association and is encoded in the manner representedin FIGS. 186 and 686.

(3) Mobile Station Type Information Element

The mobile station type information element is used for identifying thetype of mobile station and is encoded in the manner represented in FIGS.187 and 687.

(4) Paged MS ID Information Element

The paged MS ID information element is used for identifying the pagedmobile station and is encoded in the manner represented in FIGS. 188 and688.

(5) Paging ID Information Element

The paging ID information element is allocated to a call for managingthe call when a mobile station is paged. It is encoded in the mannerrepresented in FIG. 189.

(6) TMUI Information Element

The TMUI information element is used for identifying respective mobilestations and is updated when the location is registered and when thelocation registration is updated. It is encoded in the mannerrepresented in FIGS. 190 and 689.

2.5.2.4.3.5.5 Extensional Information Element

Any extensional information elements for TAC entity messages are notused in the invented system and may be used for extension in the future.The extensional information elements for TAC entity messages may beencoded in the manner represented in FIG. 191.

2.5.2.4.3.6 Others

In the following, other layer 3 messages which are carried on RACH,FACH, BCCH, and PCH will be described.

2.5.2.4.3.6.1 Message Type

FIG. 192 represents the format of the message type information element.

2.5.2.4.3.6.2 Length

FIG. 193 represents the format of the length information element whichindicates the length of the message.

2.5.2.4.3.6.3 Perch Channel Reception SIR

FIG. 194 represents the format of the perch channel reception SIRinformation element which indicates the signal-to-interference ratioabout a signal received from the perch channel.

2.5.2.4.3.6.4 Short Code Number

FIG. 195 represents the format of the short code number informationelement which indicates the short code number for the uplink or downlinkSDCCH and which takes a value between zero and 2047.

2.5.2.4.3.6.5 Frame Offset Group

FIG. 196 represents the format of the frame offset group informationelement which indicates the frame offset group for the SDCCH.

2.5.2.4.3.6.6 Slot Offset Group

FIG. 197 represents the format of the slot offset group informationelement which indicates the slot offset group for the SDCCH.

2.5.2.4.3.6.7 Network Number

FIG. 198 represents the format of the network number informationelement.

2.5.2.4.3.6.8 Network Version

FIG. 199 represents the format of the network version informationelement which indicates the network version.

2.5.2.4.3.6.9 Mobile Station Common Parameter Version

FIG. 200 represents the format of the mobile station common parameterversion information element which indicates the version of a parametercommon to mobile stations.

2.5.2.4.3.6.10 BTS Number

FIG. 201 represents the format of the BTS number information elementwhich indicates the identification number of a BTS.

2.5.2.4.3.6.11 Sector Number

FIG. 202 represents the format of the sector number information elementwhich indicates a sector number in a BTS. It may take a value betweenone and six or between one and 12.

2.5.2.4.3.6.12 Number of Overlapped Registration Areas

FIG. 203 represents the format of the information element indicating thenumber (N) of registration areas overlapped in one radio zone.

2.5.2.4.3.6.13 Area Number

FIG. 204 represents the format of the area number information elementwhich indicates the registration area where the mobile station exists.It takes a value between zero and 255.

2.5.2.4.3.6.14 Area Registration Timer

FIG. 205 represents the format of the area registration timerinformation element.

2.5.2.4.3.6.15 Calibrated Power Level Necessary for Reception at BaseStation

FIG. 206 represents the format of the information element indicating thecalibrated power level necessary for reception at the base station.

2.5.2.4.3.6.16 Uplink Long Code Number

This should be studied further. The uplink long code number informationelement will indicate the uplink long code number on the RACH and SDCCHin the future.

2.5.2.4.3.6.17 Number of Perch Channel LCs for Determination of VisitedZone

FIG. 207 represents the format of the information element indicating thenumber (M) of perch channel LCs for determination of visited zone.

2.5.2.4.3.6.18 Perch Channel LC Number

The perch channel LC number will be used in the future. This should bestudied further.

2.5.2.4.3.6.19 Number of Frequency Bands Used by Base Station

FIG. 208 represents the format of the information element indicating thenumber (K) of frequency bands used by the base station.

2.5.2.4.3.6.20 Frequency Band

FIG. 209 represents the format of the frequency band information elementindicating the frequency band used on the TCH.

2.5.2.4.3.6.21 Restricted Information

This information element will be used in the future for indicatinginformation on access restriction because of construction, ofmalfunction or of other reasons. This should be studied further.

2.5.2.4.3.6.22 Call Acceptance Information

The call acceptance information element will be used in the future forindicating to the mobile station whether a new call can be accepted ornot. This should be studied further.

2.5.2.4.3.6.23 Control Channel Format Information

The control channel format information element will be used in thefuture for indicating the number of PCHs, the number of RACHs for thelong code, the number of RACHs for the short code, the number of FACHsfor the long code, the number of FACHs for the short code, the codenumbers used, and the slot positions. The control channel formatinformation element may include information for packets. This should bestudied further.

2.5.2.4.3.6.24 BCCH Reception Duration

FIG. 210 represents the format of the BCCH reception durationinformation element indicating the duration through which the mobilestation is capable of receiving broadcasting information from the BCCHafter the reception of a message including this information element.

2.5.2.4.3.6.25 Number of Paged Mobile Stations

FIG. 211 represents the format of the information element indicating thenumber of paged mobile stations paged by one paging message. The numbertakes a value of 1-2.

2.5.2.4.3.6.26 Paged MS ID

FIG. 212 represents the format of the paged MS ID information element,of which the length is 112 bits, indicating the IMUI or TMUI of thepaged mobile station. Detailed coding manner will be decided in thefuture.

2.5.2.4.3.6.27 Paging ID

FIG. 213 represents the format of the paging ID information element.

2.5.2.4.3.6.28 Extensional Information Element

Other extensional information elements will be decided in the future.

2.5.3 Specifications of BTS-MCC Interface

Next, the specifications of the BTS-MCC interface will be described.

2.5.3.1 Outline

First, an outline will be described. In section 2.5.3, protocols oflayers 1 through 3 at the BTS-MCC interface will be described.

2.5.3.2 Layer 1

Layer 1 is formulated for BS transmission line interfaces and for BSCtransmission line interfaces. Therefore, description thereof is omitted.

2.5.3.3 ATM Layer

Similarly, ATM layer is formulated for BS transmission line interfacesand for BSC transmission line interfaces. Therefore, description thereofis omitted.

2.5.3.4 AAL Common Part Sublayer

Similarly, AAL common part sublayer is formulated for BS transmissionline interfaces and for BSC transmission line interfaces. Therefore,description thereof is omitted.

2.5.3.5 AAL Service Specific Sublayer

Similarly, AAL service specific sublayer is formulated for BStransmission line interfaces and for BSC transmission line interfaces.Therefore, description thereof is omitted.

2.5.3.6 Layer 3

In the following, layer 3 will be described.

2.5.3.6.1 Protocol Architecture

Layer 3 protocol architecture in the BTS-MCC interface will bedescribed. In addition, layer 3 protocol control entities will bedescribed. Procedures executed in the BTS-MCC interface are as follows:

(1) BTS-MCC Link Control Procedures

Link establishment and release procedures for the SDCCH between SCMF andTACF and between SCMF and SACF.

Access link establishment between TACF and BCFr.

(2) Paging Procedure

Paging instruction from TACF to BTS.

(3) Radio Wave Status Management Procedure

Status measurement of radio channels between RFTR and RRC (However, thisprocedure is not used in the invented system).

(4) Other Procedures Such as Transferring Information to BTS

In accordance with the aforementioned procedures, the following layer 3protocol control entities are used in the invented system.

(a) BC (bearer control)

This entity prepares and transfers messages for controlling the linkbetween TACF and BCFr. That is, it carries out one of procedures (1)mentioned above.

(b) BSM (base station management)

This entity prepares and transfers a message for instructing to page theBTS and any other messages for managing the BTS. That is, it carries outprocedures (2) and (4).

(c) RCM (radio condition management)

This entity prepares and transfers a message for measuring conditions ofradio resources, but is not used in the invented system.

Next, the protocol architecture in the interface will be described.Messages from the data link layer are identified by the protocoldiscriminators, link references, and transaction IDs, on the link forcontrol signals at the BTS-MCC interface, and then distributed todestination protocol control entities. FIG. 214 is a conceptual diagramrepresenting the protocol architecture on the BTS-MCC interface.

2.5.3.6.2 Message Formats

Next, formats of messages transferred on the BTS-MCC interface will bedescribed.

2.5.3.6.2.1 BC Entity Messages

First, BC entity messages will be described.

2.5.3.6.2.1.1 Types of BC Entity Messages

FIG. 690 is a list representing types of BC entity messages. As listed,bearer setup messages, bearer release messages, and other messagesbelong to BC entity messages.

2.5.3.6.2.1.2 Classification of Types of BC Entity Messages

BC entity messages in the invented system can be classified into twogroups:

one group includes messages for establishing and releasing linksaccording to AAL type 2 for the TCHs or SDCCHs. An request forestablishing and releasing links according to AAL type 2 for the ACCHand a request for controlling radio channels within the BTS may beincluded as information elements in one of these messages.

-   -   the other includes messages not relevant to state transition of        BC protocol entity. If the above request for the ACCH or for        controlling radio channels within the BTS do not accompany with        control of links according to AAL type 2 for TCHs or SDCCHs, a        message not relevant to state transition of BC protocol entity        is prepared including the request as an information element and        is transported. FIG. 691 represents the BC entity messages        according to the classification.        2.5.3.6.2.1.3 Message Format

Each message comprises common parts and one or more optional fundamentalinformation elements as represented in FIG. 215. The fundamentalinformation element includes a parameter according to the necessaryprocedure, so that the parameter depends on the procedure.

2.5.3.6.2.1.3.1 Link Setup Requested Message

The link setup requested message will be described. This message is sentfrom the BTS to the MSCNW (more specifically, BSC function) to select ashort cell connection corresponding to resources, such as a short codeand a radio facility after the selection of such resources by the BTSwhile the SDCCH is started to be established. FIG. 692 represents thestructural information elements of the link setup requested message. Asrepresented in the list, the protocol discriminator in this messageindicates BC, the connection identification is control signal betweenthe BTS and the MSCNW (BSC function), and the direction is from SCMF ofthe BTS to SACF and TACF of the MSCNW (BSC function).

2.5.3.6.2.1.3.2 Link Setup Message

The link setup message will be described. This message is sent from theMSCNW (BSC function) to the BTS when the MSCNW (BSC function) hascompleted to select a short cell connection only at the establishment ofa TCH. This message is also sent from the MSCNW (BSC function) to theBTS to activate a radio bearer. FIG. 693 represents the structuralinformation elements of the link setup message. As represented in thelist, the protocol discriminator in this message indicates BC, theconnection identification is control signal between the BTS and theMSCNW (BSC function), and the direction is from SACF and TACF of theMSCNW (BSC function) to SCMF of the BTS, and from TACF of the MSCNW (BSCfunction) to BCFr of the BTS.

2.5.3.6.2.1.3.3 Link Setup Proceeding Message

The link setup proceeding message will be described. This message issent from the BTS to the MSCNW (BSC function) to notify of the selectionresults of radio resources and activation results of radio facilities atthe first call, the second call, and the hard handover. FIG. 694represents the structural information elements of the link setupproceeding message. As represented in the list, the protocoldiscriminator in this message indicates BC, the connectionidentification is control signal between the BTS and the MSCNW (BSCfunction), and the direction is from BCFr of the BTS to TACF of theMSCNW (BSC function).

2.5.3.6.2.1.3.4 Link Setup Response Message

The link setup response message will be described. This message is sentfrom the BTS to the MSCNW (BSC function) to notify of the completion ofthe establishment of radio bearer for the first radio branch at thefirst call, the second call, and the hard handover. This message is alsosent from the BTS to the MSCNW (BSC function) to notify of the selectionresults of radio resources and activation results of radio facilities atthe second call and the hard handover. This message is also sent fromthe BTS to the MSCNW (BSC function) to notify of the synchronizationinstruction results at the base station when the SDCCH is established.FIG. 695 represents the structural information elements of the linksetup response message. As represented in the list, the protocoldiscriminator in this message indicates BC, the connectionidentification is control signal between the BTS and the MSCNW (BSCfunction), and the direction is from BCFr of the BTS to TACF of theMSCNW (BSC function), and from SCMF of the BTS to SACF and TACF of theMSCNW (BSC function).

2.5.3.6.2.1.3.5 Link Facility Message

The link facility message will be described. This message is sent fromthe MSCNW (BSC function) to the BTS in order to initiate to add anddelete radio resources and radio facilities when intra-cell HOSHO iscarried out, and in order to initiate the ACCH replacement. FIG. 696represents the structural information elements of the link facilitymessage. As represented in the list, the protocol discriminator in thismessage indicates BC, the connection identification is control signalbetween the BTS and the MSCNW (BSC function), and the direction is fromTACF of the MSCNW (BSC function) to BCFr of the BTS.

2.5.3.6.2.1.3.6 Link Facility Message

The link facility message will be described. This link facility messageis different from that described at section 2.5.3.6.2.1.3.5. Thismessage is sent from the BTS to the MSCNW (BSC function) in order tonotify of the result of the initiation to add and delete radio resourcesand radio facilities when intra-cell HOSHO is carried out, and in orderto notify of the result of the initiation of the ACCH replacement andthe squelch. FIG. 697 represents the structural information elements ofthe link facility message. As represented in the list, the protocoldiscriminator in this message indicates BC, the connectionidentification is control signal between the BTS and the MSCNW (BSCfunction), and the direction is from BCFr of the BTS to TACF of theMSCNW (BSC function).

2.5.3.6.2.1.3.7 Link Release Message

The link release message will be described. This message is sent fromthe MSCNW (BSC function) to the BTS to release a radio bearer. FIG. 698represents the structural information elements of the link releasemessage. As represented in the list, the protocol discriminator in thismessage indicates BC, the connection identification is control signalbetween the BTS and the MSCNW (BSC function), and the direction is fromTACF of the MSCNW (BSC function) to BCFr of the BTS, and from SACF andTACF of the MSCNW (BSC function) to SCMF of the BTS.

2.5.3.6.2.1.3.8 Link Release Complete Message

The link release complete message will be described. This message issent from the BTS or the MSCNW (BSC function) in order to indicate thatthe message transmitting device has released the link reference and theconnection identifier. The device which receives the message shouldrelease the link reference. FIG. 699 represents the structuralinformation elements of the link release complete message. Asrepresented in the list, the protocol discriminator in this messageindicates BC, the connection identification is control signal betweenthe BTS and the MSCNW (BSC function), and the direction is from BCFr ofthe BTS to the TACF of the MSCNW (BSC function), and from SACF and TACFof the MSCNW (BSC function) to SCMF of the BTS.

If this message is the first link reference release message, the causeindication information element is mandatory. This information element isalso included in the message if this message is sent as a result of theerror process condition.

To supplement the above description, FIG. 700 represents a list of thecombinations of the fundamental information elements in the link setupmessage in various uses. FIG. 701 represents a list of the combinationsof the fundamental information elements in the link setup proceedingmessage in various uses. FIG. 702 represents a list of the combinationsof the fundamental information elements in the link setup responsemessage in various uses. FIGS. 703 and 704 form a list of thecombinations of the fundamental information elements in the linkfacility message in various uses. FIGS. 705 and 706 form a list of thecombinations of the fundamental information elements in the other linkfacility message in various uses.

2.5.3.6.2.2 Format of BSM Entity Message

Next, formats of BSM entity messages will be described. Each BSM entitymessage may comprise a protocol discriminator, message type identifier,and one or more fundamental information elements as represented in FIG.216.

FIG. 217 represents the pattern of fundamental information elements. Aswill be apparently understood by FIG. 217, in the fundamentalinformation element, an information element identifier and a lengthidentifier are provided before each parameter.

FIG. 707 is a list representing a message belonging to the BSM entitymessage. As will be clearly understood by FIG. 707, only a pagingmessage belongs to the BSM entity message.

2.5.3.6.2.2.1 Paging Message

The paging message will be described. This message is sent from theMSCNW (BSC function) to the BTS in order to page a mobile station fornotifying that it is called. FIG. 708 represents the structuralinformation elements of the paging message. As represented in the list,the protocol discriminator in this message indicates BSM, the connectionidentification is control signal between the BTS and the network (BSCfunction), and the direction is from TACF of the network (BSC function)to BCFr of the BTS.

The area number information element of the paging message is mandatorywhen the BTS manages a plurality of area numbers for paging in aplurality of paging areas for multiple area registration. The IMUI orTMUI is used as the paged MS ID.

2.5.3.6.2.3 Detailed Description of Information Elements

Next, the information elements will be described in detail.

2.5.3.6.2.3.1 Information Elements of BC Entity Messages

Information elements of BC entity messages will be described.

2.5.3.6.2.3.1.1 Pattern of EACH Fundamental Information Element

FIG. 218 represents the pattern of each fundamental information element.

2.5.3.6.2.3.1.1.1 Link ID Information Element

FIG. 709 represents the format of the link ID information element (oneof fundamental information elements). This information element may beincluded in the link setup or link release messages from SACF and TACFof the network (BSC function) to SCMF and BCFr of the BTS.

2.5.3.6.2.3.1.1.2 TCH Setup Request Information Element WithoutFrequency Indication (Call Initiated)

FIG. 710 represents the format of the TCH setup request informationelement without frequency indication. This information element may beincluded in the link setup message from TACF of the network (BSCfunction) to BCFr of the BTS.

2.5.3.6.2.3.1.1.3 TCH Setup Request Information Element WithoutFrequency Indication (Active)

FIG. 711 represents the format of the TCH setup request informationelement without frequency indication. This information element may beincluded in the link setup message from TACF of the network (BSCfunction) to BCFr of the BTS.

2.5.3.6.2.3.1.1.4 TCH Setup Request Information Element With FrequencyIndication

FIG. 712 represents the format of the TCH setup request informationelement with frequency indication. This information element may beincluded in the link setup message from TACF of the network (BSCfunction) to BCFr of the BTS.

2.5.3.6.2.3.1.1.5 DHO Branch Addition Request Information Element

FIG. 713 represents the format of the DHO branch addition requestinformation element. This information element may be included in thelink setup message from TACF of the network (BSC function) to BCFr ofthe BTS.

2.5.3.6.2.3.1.1.6 INTRA-BS DHO Branch Addition Request InformationElement

FIG. 714 represents the format of the intra-BS DHO branch additionrequest information element. This information element may be included inthe link setup or link facility messages from TACF of the network (BSCfunction) to BCFr of the BTS.

2.5.3.6.2.3.1.1.7 ACCH Setup Request Information Element

FIG. 715 represents the format of the ACCH setup request informationelement. This information element may be included in the link setup orlink facility messages from TACF of the network (BSC function) to BCFrof the BTS.

2.5.3.6.2.3.1.1.8 TCH Setup Acceptance Information Element WithoutFrequency Indication (Call Initiated)

FIG. 716 represents the format of the TCH setup acceptance informationelement without frequency indication. This information element may beincluded in the link setup proceeding message from BCFr of the BTS toTACF of the network (BSC function).

2.5.3.6.2.3.1.1.9 TCH Setup Acceptance Information Element WithoutFrequency Indication (Active)

FIG. 717 represents the format of the TCH setup acceptance informationelement without frequency indication. This information element may beincluded in the link setup proceeding message from BCFr of the BTS toTACF of the network (BSC function).

2.5.3.6.2.3.1.1.10 TCH Setup Acceptance Information Element WithFrequency Indication

FIG. 718 represents the format of the TCH setup acceptance informationelement with frequency indication. This information element may beincluded in the link setup proceeding message from BCFr of the BTS toTACF of the network (BSC function).

2.5.3.6.2.3.1.1.11 TCH Setup Response Information Element WithoutFrequency Indication (Call Initiated)

FIG. 719 represents the format of the TCH setup response informationelement without frequency indication. This information element may beincluded in the link setup response message from BCFr of the BTS to TACFof the network (BSC function).

2.5.3.6.2.3.1.1.12 TCH Setup Response Information Element WithoutFrequency Indication (Active)

FIG. 720 represents the format of the TCH setup response informationelement without frequency indication. This information element may beincluded in the link setup response message from BCFr of the BTS to TACFof the network (BSC function).

2.5.3.6.2.3.1.1.13 TCH Setup Response Information Element With FrequencyIndication

FIG. 721 represents the format of the TCH setup response informationelement with frequency indication. This information element may beincluded in the link setup response message from BCFr of the BTS to TACFof the network (BSC function).

2.5.3.6.2.3.1.1.14 DHO Branch Addition Response Information Element

FIG. 722 represents the format of the DHO branch addition responseinformation element. This information element may be included in thelink setup response message from BCFr of the BTS to TACF of the network(BSC function).

2.5.3.6.2.3.1.1.15 INTRA-BS DHO Branch Addition Response InformationElement

FIG. 723 represents the format of the intra-BS DHO branch additionresponse information element. This information element may be includedin the link setup response or link facility messages from BCFr of theBTS to TACF of the network (BSC function).

2.5.3.6.2.3.1.1.16 ACCH Setup Response Information Element

FIG. 724 represents the format of the ACCH setup response informationelement. This information element may be included in the link setupresponse or link facility messages from BCFr of the BTS to TACF of thenetwork (BSC function).

2.5.3.6.2.3.1.1.17 INTRA-BS DHO Branch Addition Request InformationElement

FIG. 725 represents the format of the intra-BS DHO branch additionrequest information element. This information element may be included inthe link facility message from TACF of the network (BSC function) toBCFr of the BTS.

2.5.3.6.2.3.1.1.18 INTRA-BS DHO Branch Deletion Request InformationElement

FIG. 726 represents the format of the intra-BS DHO branch deletionrequest information element. This information element may be included inthe link facility message from TACF of the network (BSC function) toBCFr of the BTS.

2.5.3.6.2.3.1.1.19 INTRA-BS HHO Initiation Request Information Element

FIG. 727 represents the format of the intra-BS HHO initiation requestinformation element. This information element may be included in thelink facility message from TACF of the network (BSC function) to BCFr ofthe BTS.

2.5.3.6.2.3.1.1.20 ACCH Release Request Information Element

FIG. 728 represents the format of the ACCH release request informationelement. This information element may be included in the link facilitymessage from TACF of the network (BSC function) to BCFr of the BTS.

2.5.3.6.2.3.1.1.21 Frequency Replacement Request Information ElementWithout Frequency Indication

FIG. 729 represents the format of the frequency replacement requestinformation element without frequency indication. This informationelement may be included in the link facility message from TACF of thenetwork (BSC function) to BCFr of the BTS.

2.5.3.6.2.3.1.1.22 Frequency Replacement Request Information ElementWith Frequency Indication

FIG. 730 represents the format of the frequency replacement requestinformation element with frequency indication. This information elementmay be included in the link facility message from TACF of the network(BSC function) to BCFr of the BTS.

2.5.3.6.2.3.1.1.23 Setup Completion Notification Information Element

FIG. 731 represents the format of the setup completion informationelement. This information element may be included in the link facilitymessage from TACF of the network (BSC function) to BCFr of the BTS.

2.5.3.6.2.3.1.1.24 INTRA-BS HHO Branch Deletion Response InformationElement

FIG. 732 represents the format of the intra-BS HHO branch deletionresponse information element. This information element may be includedin the link facility message from BCFr of the BTS to TACF of the network(BSC function).

2.5.3.6.2.3.1.1.25 INTRA-BS HHO Branch Addition Response InformationElement

FIG. 733 represents the format of the intra-BS HHO branch additionresponse information element. This information element may be includedin the link facility message from BCFr of the BTS to TACF of the network(BSC function).

2.5.3.6.2.3.1.1.26 ACCH Release Response Information Element

FIG. 734 represents the format of the ACCH release response informationelement. This information element may be included in the link facilitymessage from BCFr of the BTS to TACF of the network (BSC function).

2.5.3.6.2.3.1.1.27 Frequency Replacement Setup Response InformationElement With Frequency Indication

FIG. 735 represents the format of the frequency replacement responseinformation element with frequency indication. This information elementmay be included in the link facility message from BCFr of the BTS toTACF of the network (BSC function).

2.5.3.6.2.3.1.1.28 Frequency Replacement Setup Request InformationElement With Frequency Indication

FIG. 736 represents the format of the frequency replacement requestinformation element with frequency indication. This information elementmay be included in the link facility message from BCFr of the BTS toTACF of the network (BSC function).

2.5.3.6.2.3.1.1.29 Frequency Replacement Acceptance Information ElementWithout Frequency Indication

FIG. 737 represents the format of the frequency replacement acceptanceinformation element without frequency indication. This informationelement may be included in the link facility message from BCFr of theBTS to TACF of the network (BSC function).

2.5.3.6.2.3.1.1.30 Frequency Replacement Response Information ElementWithout Frequency Indication

FIG. 738 represents the format of the frequency replacement responseinformation element without frequency indication. This informationelement may be included in the link facility message from BCFr of theBTS to TACF of the network (BSC function).

2.5.3.6.2.3.1.1.31 Code Replacement Request Information Element

FIG. 739 represents the format of the code replacement requestinformation element. This information element may be included in thelink facility message from BCFr of the BTS to TACF of the network (BSCfunction).

2.5.3.6.2.3.1.1.32 TCH Release Request Information Element

FIG. 740 represents the format of the TCH release request informationelement. This information element may be included in the link releasemessage from TACF of the network (BSC function) to BCFr of the BTS.

2.5.3.6.2.3.1.1.33 SDCCH Release Request Information Element

FIG. 741 represents the format of the SDCCH release request informationelement. This information element may be included in the link releasemessage from SACF and TACF of the network (BSC function) to SCMF of theBTS.

2.5.3.6.2.3.1.1.34 Cause Information Element

FIG. 742 represents the format of the cause information element. Thisinformation element may be included in the link release complete messagefrom BCFr of the BTS to TACF of the network (BSC function), and fromSCMF of the BTS to SACF and TACF of the network (BSC function).

2.5.3.6.2.3.1.1.35 SDCCH Setup Request Information Element

FIG. 743 represents the format of the SDCCH setup request informationelement. This information element may be included in the link setuprequested message from SCMF of the BTS to SACF and TACF of the network(BSC function).

2.5.3.6.2.3.1.1.36 LAI Setup Request Information Element

FIG. 744 represents the format of the LAI setup request informationelement. This information element may be included in the link setuprequested message from SCMF of the BTS to SACF and TACF of the network(BSC function).

2.5.3.6.2.3.1.2 Definitions of Information Elements of BC EntityMessages

Next, definitions of information elements of BC entity messages will bedescribed.

2.5.3.6.2.3.1.2.1 Protocol Discriminator

First, the protocol discriminator will be described. The protocoldiscriminator is formulated to distinguish the BC entity message fromother messages used in the invented system and from other OSI networklayer protocol unit messages encoded in accordance with another ITU-Trecommendation, TTC recommendation, and another recommendation. Theprotocol discriminator is located at the first part of each BC entitymessage and encoded in the manner shown in FIGS. 219 and 745.

2.5.3.6.2.3.1.2.2 Message Type Identifier

Next, the message type identifier will be described. The message typeidentifier is formulated to identify the function of the BC entitymessage. The message type identifier is located at the second part ofeach BC entity message and encoded in the manner shown in FIGS. 220 and746.

2.5.3.6.2.3.1.2.3 Link Reference

Next, the link reference will be described. The link reference isformulated to identify each instance of the BC protocol entity generatedfor AAL type 2/type 5 link for the TCH or SDCCH. The link reference isencoded in the manner shown in FIG. 221.

In FIG. 221, “flag” denotes an E/O flag. This flag indicates zero whenthe message is sent from the device which has generated the linkreference. This flag indicates one when the message is sent to thedevice which has generated the link reference. Octet 2 and later octetsare extended according to the value of the used link reference.

2.5.3.6.2.3.1.2.4 Information Element Identifier

Next, the information element identifier will be described. Theinformation element identifier is formulated to identify an optionalinformation element included in the BC entity message. The informationelement identifier is encoded in the manner shown in FIG. 222.

2.5.3.6.2.3.1.2.5 Length of Information Element

Next, the “length of information element” will be described. The lengthof information element is formulated to indicate the whole length of allof parameters in the fundamental information element. The length ofinformation element is encoded in the manner shown in FIG. 223.

2.5.3.6.2.3.1.2.6 AAL Type and Link Identifier

The “AAL type” indicates the AAL type and is encoded in the manner shownin FIG. 224. It indicates AAL type 2 when it is encoded as “0010.” Itindicates AAL type 5 when it is encoded as “0101.”

An example of encoded link identifier is represented in FIG. 225. InFIG. 225, the size of VPCI and the size of VCI (virtual channelidentifier) comply with the standard cell of the ATM specification inconnection with the UNI (user-network interface). One type of VPCIindicating zero is used in the invented system, but 16 or more types ofVPCI of which the length is 4 or more bits may be used in commercialapplication. VCI is 256/VPCI and UCI is 256/VCI.

2.5.3.6.2.3.1.2.7 Transmission Quality

Next, the “transmission quality” will be described. The transmissionquality indicates the quality of ATM link and is encoded in the mannershown in FIG. 226. In the field of the transmission quality of oneoctet, the length of the acceptable delay may be three bits, the lengthof the cell loss rate may be three bits, and the reserved bits may betwo bits according to the invented system.

2.5.3.6.2.3.1.2.8 Forward (Downlink) Transmission Rate

Next, the “forward or downlink transmission rate” will be described. Theforward transmission rate indicates the forward information transmissionrate. In the invented system, the forward transmission rate is selectedfrom the group consisting of 8 kbps, 12.8 kbps, 32 kbps, 34.4 kbps, 64kbps, 76.8 kbps, 128 kbps, 162.4 kbps, and 384 kbps.

2.5.3.6.2.3.1.2.9 Reverse (Uplink) Transmission Rate

Next, the “reverse or uplink transmission rate” will be described. Thereverse transmission rate indicates the reverse information transmissionrate. In the invented system, the reverse transmission rate is selectedfrom the group consisting of 8 kbps, 12.8 kbps, 32 kbps, 34.4 kbps, 64kbps, 76.8 kbps, 128 kbps, 162.4 kbps, and 384 kbps.

2.5.3.6.2.3.1.2.10 Sector Number

Next, the “sector number” will be described. The sector number is avalue of 1-12 for identifying the corresponding sector in the BTS and isencoded in the manner shown in FIG. 227.

2.5.3.6.2.3.1.2.11 Bearer Capability

Next, the “bearer capability” will be described. The bearer capabilityis encoded in the manner represented in FIG. 228 and may indicate voiceservice, packet service, or unrestricted digital service.

2.5.3.6.2.3.1.2.12 Frequency Selection Info.

Next, the “frequency selection information” will be described. Thefrequency selection information is an information element of 0-255indicating frequency bands which may be employed by the mobile stationand is sent from the mobile communications switching center to the basestation when the base station should select the communication frequency.Upon reception of the frequency selection information, the base stationselects the most appropriate frequency band which may be employed by thebase station and mobile station. The frequency selection information isencoded in the manner represented in FIG. 229.

2.5.3.6.2.3.1.2.13 Frequency

Next, the “frequency” will be described. The frequency informationelement indicates the frequency band selected by the base station.Simultaneous link connections for the same mobile station may use thesame frequency band. The frequency information element which indicatesone of f1 to f256 is encoded in the manner represented in FIG. 230.

2.5.3.6.2.3.1.2.14 Frame Offset Group

Next, the “frame offset group” will be described. The frame offset groupindicates which time slot in a single radio frame should be the frontend of the logical frame when the mobile station communicates. This isformulated to uniformize traffic in a single frame time unit within thewired path. “Frame offset group” takes a value of 0-15 and is encoded inthe manner represented in FIG. 231.

2.5.3.6.2.3.1.2.15 Slot Offset Group

Next, the “slot offset group” will be described. The slot offset groupindicates an offset value of downlink transmission timing for a shortcode. The downlink transmission timing may be offset by, at most, 15subslots in order to reduce redundancy of pilot symbols. The offsetvalue is acquired at the BTS when the first call occurs, is stored bythe BSC function of the network, and is included in the slot offsetgroup information element. The indication by the slot offset group atthe first call should be contained until the release of all calls of themobile station. The slot offset group is encoded in the manner shown inFIG. 232.

2.5.3.6.2.3.1.2.16 Long Code Phase Difference

Next, the “long code phase difference” will be described. The long codephase difference indicates the difference between the long code phasecalculated by a long code counter (SFN) for the visited perch channel orthe uplink long code phase of the in-use sector and the long code phasecalculated by a long code counter (SFN) for the perch of the surroundingsector (handover destination sector) represented in chip time. This isused when the execution of DHO and the zone selection at call attempt oracceptance. The long code phase is measured by the mobile station, andreported to the BSC of the network. The long code difference should bewithin the range between zero and 2-1 chip time and be encoded in themanner represented in FIG. 233. When the long code phase difference isin excess of 128 chip time, the field should be extended with extensionbits.

2.5.3.6.2.3.1.2.17 Reverse Long Code Number

Next, the “reverse or uplink long code number” will be described. Thein-use reverse long code number is a specific information to the mobilestation. The information can be utilized continuously although thefrequency band has been updated. The reverse long code number is encodedin the manner represented in FIG. 234.

2.5.3.6.2.3.1.2.18 Reverse Short Code Type

Next, the “reverse or uplink short code type” will be described. Thereverse short code type is encoded in the manner represented in FIG.235.

2.5.3.6.2.3.1.2.19 Number of Reverse Short Codes

Next, the “number of reverse or uplink short codes” will be described.The number of reverse short codes indicates the number of reverse shortcodes when a plurality of reverse short codes are used for a reversechannel of one connection. The number of reverse short codes is encodedin the manner represented in FIG. 236.

2.5.3.6.2.3.1.2.20 Reverse Short Code Number

Next, the “reverse or uplink short code number” will be described. Thereverse short code number is a value of 0-1023 for identifying theemployed reverse short code. This is a unique number for distinguishingthe corresponding short code from others which are used for the samemobile station although a single long code is used for the mobilestation. At the first reverse short code number field, the short codenumber for the ACCH is contained. When VPCI, VCI, and UCI for ACCH hasbeen designated simultaneously, the BTS recognizes that the ACCH isnecessary to be established. The reverse short code number is encoded inthe manner represented in FIG. 237.

2.5.3.6.2.3.1.2.21 Forward Short Code Type

Next, the “forward or downlink short code type” will be described. Theforward short code type is encoded in the manner represented in FIG.238.

2.5.3.6.2.3.1.2.22 Number of Forward Short Codes

Next, the “number of forward or downlink short codes” will be described.The number of forward short codes indicates the number of forward shortcodes when a plurality of forward short codes are used for a forwardchannel of one connection. The number of forward short codes is encodedin the manner represented in FIG. 239.

2.5.3.6.2.3.1.2.23 AAL Type and Link Identifier for ACCH

The “AAL type” for the ACCH indicates the AAL type. It is always encodedas “0010” for indicating AAL type 2 and is encoded in the manner shownin FIG. 240.

An example of encoded link identifier for the ACCH is represented inFIG. 241. The link identifier and TCH may be different.

2.5.3.6.2.3.1.2.24 Transmission Quality for ACCH

Next, the “transmission quality” for the ACCH will be described. Thetransmission quality indicates the quality of ATM link and is encoded inthe manner shown in FIG. 242. In the field of the transmission qualityof one octet, the length of the acceptable delay may be three bits, thelength of the cell loss rate may be three bits, and the reserved bitsmay be two bits according to the invented system.

2.5.3.6.2.3.1.2.25 Forward Transmission Rate for ACCH

Next, the “forward or downlink transmission rate” for the ACCH will bedescribed. The forward transmission rate indicates the forwardinformation transmission rate which is restricted by the code used forthe TCH. In the invented system, the forward transmission rate isselected from the group consisting of 8 kbps, 12.8 kbps, 32 kbps, 34.4kbps, 64 kbps, 76.8 kbps, 128 kbps, 162.4 kbps, and 384 kbps.

2.5.3.6.2.3.1.2.26 Reverse Transmission Rate for ACCH

Next, the “reverse or uplink transmission rate” for the ACCH will bedescribed. The reverse transmission rate indicates the reverseinformation transmission rate. In the invented system, the reversetransmission rate is selected from the group consisting of 8 kbps, 12.8kbps, 32 kbps, 34.4 kbps, 64 kbps, 76.8 kbps, 128 kbps, 162.4 kbps, and384 kbps.

2.5.3.6.2.3.1.2.27 Forward Short Code Number

Next, the “forward or downlink short code number” will be described. Theforward short code number is a value of 0-1023 for identifying theemployed forward short code. This is a unique number for distinguishingthe corresponding short code from others which are used for the samemobile station although a single long code is used for the mobilestation. The forward short code number is encoded in the mannerrepresented in FIG. 243.

2.5.3.6.2.3.1.2.28 Result

The “result” is formulated for indicating the result, i.e., OK or NG andis encoded in the manner represented in FIG. 244.

2.5.3.6.2.3.1.2.29 Cause

Next, the “cause” will be described. When the link release completemessage is the first link reference release message, this informationelement is mandatory. If the link release complete message istransmitted as a result of an error treatment condition, thisinformation element is included. The cause is encoded in the mannerrepresented in FIG. 245.

2.5.3.6.2.3.1.2.30 Initial Transmission Power

Next, the “initial transmission power” will be described. The initialtransmission power indicates the downlink transmission power and isencoded in the manner represented in FIG. 246.

2.5.3.6.2.3.1.2.32 Location Identity

Next, the “location identity” will be described. The location identityis utilized for identifying the location registration area where themobile station visits. This takes a value between zero and 255 and isencoded in the manner represented in FIG. 247.

2.5.3.6.3.2 Formats of Information Elements of BSM Entity Messages

Next, the formats of information elements of BSM entity messages will bedescribed.

2.5.3.6.3.2.1 Protocol Discriminator

First, the protocol discriminator will be described. The protocoldiscriminator is formulated to distinguish the BSM entity message fromother messages used in the invented system and from other OSI networklayer protocol unit messages encoded in accordance with another ITU-Trecommendation, TTC recommendation, and another recommendation. Theprotocol discriminator is located at the first part of each BSM entitymessage and encoded in the manner shown in FIGS. 248 and 747.

2.5.3.6.3.2.2 Message Type Identifier

Next, the message type identifier will be described. The message typeidentifier is formulated to identify the function of the BC entitymessage. The message type identifier is located at the second part ofeach BC entity message and encoded in the manner shown in FIGS. 249 and748.

2.5.3.6.3.2.3 PCHs Calculation Information

Next, the “PCHs calculation information” will be described. The “PCHsCalculation Information” is an information element for the BTS to selectthe perch channel. This information element is, for example, representedat inferior 16 bits of the binary encoded IMUI. That is, the PCHscalculation information can be recognized by a part of the IMUI of eachmobile station. This is encoded in the manner represented in FIG. 250.

2.5.3.6.3.2.4 Area Number

Next, the “area number” will be described. The area number is utilizedfor identifying the location registration area where the mobile stationvisits. This takes a value between zero and 255 and is encoded in themanner represented in FIG. 251.

2.5.3.6.3.2.5 Paged MS ID

Next, the “paged MS ID” will be described. The paged MS ID is the TMUIor IMUI for paging the subject mobile station. If the IMUI is used asthe paged MS ID, the integer IMUI transformed from the IMUI coded withBCD. The paged MS ID is encoded in the manner represented in FIG. 252.

2.5.3.6.3.2.5.1 Number Type

The “number type” indicates the type of number which is included atoctet 4 and later octets in the paged MS ID. The number type is encodedin the manner represented in FIG. 749.

2.5.3.6.3.2.5.2 Number Length

The “number length” indicates the length, represented in octets, ofnumber which is included at octet 4 and later octets in the paged MS ID.The number length is encoded in the manner represented in FIG. 750. Thenumber length does not include the total length of octets 1-3 of thepaged MS ID.

2.5.3.6.3.2.5.3 TMUI

Next, the “TMUI information element” will be described. The TMUI is usedfor identifying the mobile station. The TMUI is updated whenever thearea registration or updating thereof is carried out. This isdynamically allotted to the mobile station. The length of the TMUIinformation element is fixed to four octets.

2.5.3.6.3.2.5.4 Integer IMUI

Next, the “integer IMUI” will be described. The integer IMUI is used foridentifying the mobile station. The IMUI is used in the second pagingwhen the network has recognized that the TMUI stored in the mobilestation replying to the first paging with TMUI is wrong. The integerIMUI is transformed from the IMUI coded with BCD, and has a variablelength, at most, seven octets.

2.5.3.6.3.2.5.4 Paging ID

Next, the “paging ID” will be described. The paging ID is used formanaging the paging call when paging the mobile station. The paging IDis temporally allotted when paging. The paging ID information element isencoded in the manner represented in FIG. 253.

2.5.3.6.4.1 SDL Diagrams for BC

To supplement the above description, various SDL diagrams for bearercontrol are represented in FIGS. 255 through 258. FIG. 255 represents anSDL diagram for bearer control in the SDCCH executed in the BSC functionof the network. FIG. 256 represents an SDL diagram for bearer control inthe TCH/ACCH executed in the BSC function of the network. FIG. 257represents an SDL diagram for bearer control in the SDCCH executed inthe BTS. FIG. 258 represents an SDL diagram for bearer control in theTCH/ACCH executed in the BTS.

2.5.3.6.4.2 SDL Diagram for BSM

In addition, FIG. 254 represents an SDL diagram for base stationmanagement.

3 Control Procedures Uniquely Carried out by the Invented System

The invented system can carry out unique control procedures which cannotbe achieved by prior arts since it uses the above-described structuresand protocol specifications. Such unique control procedures will bedescribed hereinafter.

3.1 Ciphering Onset Moment Notification

3.1.1 Background of Invention of the Procedure

As described above, if the ciphering onset moment is not recognized, thedestination device cannot decipher the ciphered signal (control signal)although it has received the ciphered signal. That is, if the onset timeof the decipherment may be misestimated, the meaning of signals cannotbe made out.

In a solution of the above-described problem, it is possible that afterthe transmission of an enciphering onset request from the network to themobile station, the network and the mobile station commence to enciphertransmitted signals and to decipher received signals.

This solution method will be described in more detail with reference toFIGS. 755 and 756. FIG. 755 represents a ciphering procedure sequencediagram in normal operation where the network and the mobile stationcommence to encipher transmitted signals and to decipher receivedsignals after the transmission of an enciphering onset request from thenetwork to the mobile station. In the initial stage, assume that thetransported signals between the mobile station and network are notciphered.

As represented in FIG. 755, the network (NW) notifies the mobile station(MS) of the enciphering onset request at step S21. After thenotification of the enciphering onset request, the network commences toencipher transmitted signals and to decipher received signals at stepS22.

Upon reception of the enciphering onset request, the mobile station alsocommences to encipher transmitted signals and to decipher receivedsignals at step S23. Thereafter, the network and the mobile stationencipher transmitted signals and decipher received signals.

However, in the above-described prior art ciphering procedure sequence,there is likelihood of failure of decipher because of the differencebetween the time when the source device commences to encipher thetransmitted signal and the time when the destination device commences todecipher the received signal.

For example, as represented in FIG. 756, although the network hastransmitted the enciphering onset request at step S24, assume that themobile station has transmitted at step S25 a call release request fordisconnect the call to the network before the reception of theenciphering onset request at the mobile station. In this case, when thenetwork receives the non-ciphered call release request at the receptiontime Tx, the network has already been prepared to decipher the receivedsignal at step S26. If the network does not have the function torecognize both of enciphered and non-ciphered signals at the samemode—this kind of network is usual for system simplification—, it cannotread the non-ciphered call release request, so that the procedure isblocked.

It is therefore an object of the present invention to provide a controlmethod for a mobile station, network, and mobile communication system toread received signals with the least amount of failure by means of theciphering onset at the source simultaneously with the deciphering onsetat the destination.

3.1.2 Outline of the Ciphering Onset Moment Notification of Embodiment

The outline of ciphering onset moment notification according to anembodiment of the present invention will be described. FIG. 757represents a ciphering procedure sequence diagram in normal operationaccording to the embodiment. In the initial stage, assume that thetransported signals between the mobile station and network are notciphered.

As represented in FIG. 757, the network (NW) notifies the mobile station(MS) of the enciphering onset request at step S31. After thenotification of the enciphering onset request, the network commences toencipher transmitted signals (downlink or forward signals) at step S32.

Upon reception of the enciphering onset request, the mobile stationcommences to decipher received signals at step S33. Thereafter, thenetwork enciphers transmitted signals while the mobile station deciphersreceived signals.

Furthermore, the mobile station sends the network the enciphering onsetresponse for acknowledging the enciphering onset request at step S34.After the notification of the enciphering onset response, the mobilestation commences to encipher transmitted signals (uplink or reversesignals) at step S35.

Upon reception of the enciphering onset response, the network commencesto decipher received signals at step S36.

Accordingly, the mobile station does not commence deciphering thereceived signal until it receives the ciphering onset request.Similarly, the network does not commence deciphering the received signaluntil it receives the ciphering onset response. Therefore, thedestination device can read received signals with the least amount offailure by means of the ciphering onset at the source simultaneouslywith the deciphering onset at the destination.

For example, as represented in FIG. 758, assume that the network hastransmitted the enciphering onset request at step S37, and that themobile station has transmitted at step S38 a call release request fordisconnect the call to the network before the reception of theenciphering onset request at the mobile station. In this case, when thenetwork receives the non-ciphered call release request at the receptiontime T×1, the network has not yet been prepared to decipher the receivedsignal at step S39 although it has been prepared to encipher thetransmitted signal. Therefore, although the network does not have thefunction to recognize both of enciphered and non-ciphered signals at thesame mode—this kind of network is usual for system simplification—, itcan read the non-ciphered call release request smoothly.

3.1.3 Detailed Description of the Ciphering Onset Moment Notification ofEmbodiment

The ciphering onset moment notification of embodiment will be furtherdescribed in more detail. With reference to the functional model in FIG.64, the encipherment onset moment notification procedures will bedescribed. As shown in FIG. 64, the mobile station MS includesfunctional entities called UIMF, MCF, and TACAF. UIMF stores informationon the station user and serves the user authentication and enciphermentcalculation. MCF functions as an interface with the network forrealizing services that are not related to calls. TACAF controls theaccess processes to the mobile station terminal, e.g., the origination,paging, and so on.

The network on the other hand includes functional entities called SACF,TACF, LRCF, and LRDF. SACF is connected with MCF to function as aninterface with the mobile terminal for realizing services that are notrelated to calls. TACF is connected with TACAF to control the accessprocesses to the mobile station terminal, e.g., the origination, paging,and so on. LRCF is connected with TACF and SACF to control mobilitymanagement. LRDF stores various data on mobility management.

With such a structure, prior to the mutual notification of theencipherment onset, a user authentication procedure (refer to section2.4.5.1) is executed as shown in FIG. 63. In execution of the userauthentication procedure, a certified encipherment key is previouslystored at UIMF and LRDF of the network and mobile terminal and deliveredto TACAF, MCF, TACF, and SACF.

Then, mutual notification of the encipherment onset time is carried outin accordance with the sequence shown in FIG. 65. More specifically,first, LRCF of the network sends a START CIPHERING request indicationfor indicating that the network will start encipherment to TACAF and MCFof the mobile terminal via TACF and SACF of the network. Consequently,the mobile terminal can recognize that the succeeding signalstransmitted from the network will be ciphered. After the transmission ofthe START CIPHERING request indication, TACF and SACF, of the networkcipher succeeding signals according to a preselected enciphermentprocedure using a preselected ciphering key. Once the mobile terminalreceives the enciphered signal, TACAF and MCF controls the deciphermentof the received signals. In advance to the decipherment, TACAF and MCFreceive the encipherment key from UIMF to carry out the decipherment.Accordingly, the downlink signal transmitted from the network can betransported in secret and interpreted by only the mobile terminal.

Next, TACAF and MCF of the mobile terminal send a START CIPHERINGresponse confirmation to TACF and SACF of the network, this confirmationindicating that mobile station will next start to transmit encipheredsignals. Consequently, the network entities can recognize that thesucceeding signals transmitted from the mobile terminal will beciphered. After the transmission of the START CIPHERING responseconfirmation, TACAF and MCF of the mobile terminal cipher succeedingsignals according to a preselected encipherment procedure using apreselected ciphering key. Once the terminal entities receive theenciphered signal, TACF and SCF decipher the received signals.Accordingly, the uplink signal transmitted from the mobile terminal canbe transported in secret and interpreted by only the network.

Therefore, although the network does not have the function to recognizeboth of enciphered and non-ciphered signals at the same mode for systemsimplification, communications can be achieved between the mobilestation and the network smoothly with the least amount of failure bymeans of the ciphering onset at the source simultaneously with thedeciphering onset at the destination.

3.2 Selection of Encipherment Manner by Negotiation Between MobileStation and Network

3.2.1 Background of Invention of the Procedure

FIG. 759 is a schematic sequence diagram representing an enciphermentmethod in a mobile communications system, in which only one specificencipherment manner is adopted. In this mobile communications system,once a mobile station (MS) requests to communicate with the network (NW)at step S41, it is necessary to carry out during the communications (atstep S42) the specific encipherment manner including only one specificencipherment procedure or the combination of only one specificencipherment procedure and an encipherment key preparation procedure.

In this system, if the user of the mobile station would like to select alevel of security, it is impossible to select a suitable enciphermentprocedure or a suitable encipherment key preparation procedure.

In addition, it is impossible for the mobile station or the network toselect a suitable encipherment procedure or a suitable encipherment keypreparation procedure for multimedia service, such as transmission ofvoice or motion pictures although the communications system permits totransmit them.

Furthermore, if it is necessary to improve encipherment in view offunction extension, such as a new service, of the mobile communicationssystem in the future, it will be difficult to adopt a new suitableencipherment procedure or a new suitable encipherment key preparationprocedure.

Furthermore, it is necessary that various mobile communications networksutilize all of the encipherment procedures in common in order thatmobile stations roam across service areas of mobile communicationsnetworks.

It is therefore an object of the present invention to provide a controlmethod for a mobile station, network, and mobile communication system todeal flexibly various encipherment procedures and encipherment keypreparation procedures. A preferable embodiment will be described nextwith reference to FIGS. 760 through 762.

3.2.2 Outline of Selection of the Encipherment Manner by NegotiationBetween Mobile Station and Network in Accordance With Embodiment

FIG. 760 represents a schematic sequence diagram representing theselection of encipherment manner by negotiation between mobile stationand network in accordance with an embodiment. First, the mobile station(MS) requests to communicate with the network (NW) at step S51.Simultaneously, the mobile station notifies the network of types ofencipherment manners which can be executed by the mobile station. Theencipherment manners may include only encipherment procedures orencipherment procedures and encipherment key preparation proceduresalthough FIG. 760 illustrates types of encipherment procedures A, B, andC.

In view of the notification from the mobile station, the network selectsa type of encipherment manner at step S52. For example, a type ofencipherment procedure A is selected in FIG. 760. Prior to enciphermentcommunication, the network sends the mobile station an enciphermentonset request indicating the selected type of encipherment manner atstep S53.

The mobile station then adapts the inside functions according to thetype of encipherment manner (encipherment procedure A in FIG. 760)selected by the network at step S54. The network also adapts the insidedevice functions according to the type of encipherment manner(encipherment procedure A in FIG. 760) selected by the network at stepS55.

Accordingly, the mobile station and network are allowed to communicatewith each other at step S56 in such a fashion that they use the selectedencipherment manner (e.g., encipherment procedure A in FIG. 760).Therefore, if the user of the mobile station would like to select alevel of security, it is possible to select a suitable enciphermentprocedure or a suitable encipherment procedure and a suitableencipherment key preparation procedure.

In addition, it is possible for the mobile station or the network toselect a suitable encipherment procedure or a suitable encipherment keypreparation procedure for multimedia service, such as transmission ofvoice or motion pictures if the communications system permits totransmit them.

Furthermore, if it is necessary to improve encipherment in view offunction extension, such as a new service, of the mobile communicationssystem in the future, it will be easy to adopt a new suitableencipherment procedure or a new suitable encipherment key preparationprocedure.

Furthermore, if a plurality of mobile communications networks utilizemimimal encipherment manners in common, it is possible to communicateunder a suitable encipherment manner when mobile stations roam acrossservice areas of mobile communications networks. It is unnecessary thatvarious mobile communications networks utilize all of the enciphermentprocedures in common: each communications network can execute otherunique encipherment procedures.

3.2.3 Detailed Description of the Selection of Encipherment Manner byNegotiation Between Mobile Station and Network in Embodiment

The selection of encipherment manner by negotiation between mobilestation and network in accordance with an embodiment will be furtherdescribed in more detail with reference to the sequential diagramconstituted of FIGS. 761 and 762. In the following description, anencipherment procedure and an encipherment key preparation procedure areselected at the selection of the encipherment manner. In FIGS. 761 and762, only parameters involved in the encipherment are illustrated andparameters only involved in the authentication are not illustrated forsimplifying the description of the encipherment.

A security control unit of the mobile station decides an order ofpriorities of the types of the encipherment procedures which can beexecuted by the mobile station and an order of priorities of the typesof the encipherment key procedures which can be executed by the mobilestation at step S61 before encipherment communication. The securitycontrol unit of the mobile station sends a security control unit of thenetwork a call setup request at step S62. The call setup requestincludes information on the types of encipherment procedures A, B, and Cwhich can be executed by the mobile station; the types of enciphermentkey preparation procedures X, Y, and Z which can be executed by themobile station; and the priority order. Upon the reception, the securitycontrol unit of the network stores the information on the types ofencipherment procedures A, B, and C at step S63.

Next, the security control unit of the network notifies a userinformation control unit of the network of the information on the typesof encipherment key preparation procedures X, Y, and Z at step S64. Uponthe reception, the user information control unit prepares a randomnumber at step S65. Furthermore, the user information control unitselects an encipherment key preparation procedure from the keypreparation procedures X, Y, and Z at step S66.

Then, the user information control unit prepares an encipherment key atstep S67 in accordance with the random number prepared at step S65 andthe type of encipherment key preparation procedure (e.g., X as in FIG.761) selected at step S66. Subsequently, the user information controlunit transfers the prepared random number, the prepared enciphermentkey, and the selected type of encipherment key preparation procedure(e.g., X as in FIG. 761) as authentication information to the securitycontrol unit at step S68.

Then, the security control unit of the network stores the preparedencipherment key at step S69, and transmits an authentication requestindicating the prepared random number and the selected type ofencipherment key preparation procedure (e.g., X as in FIG. 761) to thesecurity control unit of the mobile station at step S70. In thetransmission at step S70, other parameters for authenticationcalculation are included in the authentication request.

Upon the reception of the authentication request, the security controlunit of the mobile station sends an authentication calculation requestindicating the random number and the type of encipherment keypreparation procedure (e.g., X as in FIG. 761) to a user informationcontrol unit of the mobile station at step S71.

Upon the reception of the authentication calculation request, the userinformation control unit of the mobile station prepares anotherencipherment key at step S72 in accordance with the random number andthe type of encipherment key preparation procedure (e.g., X as in FIG.761). As represented in FIG. 762, the user information control unitsends the security control unit of the mobile station an authenticationcalculation result indicating the prepared encipherment key at step S74.

Then, the security control unit of the mobile station stores theencipherment key prepared at the user information control unit of themobile station at step S75. In addition, the security control unitnotifies at step S76 the security control unit in the network of anauthentication response including the authentication calculation resultobtained by a calculation at the user information control unit.

Upon the reception of the authentication response, the security controlunit of the network sends the user information control unit of thenetwork at step S77 an authentication calculation comparison requestindicating the authentication calculation result sent from the mobilestation. The user information control unit, then, compares theauthentication calculation result with another authenticationcalculation result prepared at the network in accordance with theencipherment key prepared at step S67 and other parameters forauthentication (not illustrated).

After the completion of the authentication, the user information controlunit of the network can send an encipherment request to the securitycontrol unit of the network at step S78.

Upon the reception of the encipherment request, the security controlunit of the network transmits at step S79 another encipherment requestindicating the encipherment key stored at step S69 and the types ofencipherment procedures A, B, and C stored at step S63 to a radio accesscontrol unit of the network.

Then, the radio access control unit of the network selects anencipherment procedure from the procedures A, B, and C at step S80. Forexample, the type of procedure B is selected in FIG. 762. The radioaccess control unit in the network sends another encipherment requestindicating the selected type of encipherment procedure (B) to a radioaccess control unit of the mobile station at step S81.

Upon the reception of the encipherment request, the radio access controlunit of the mobile station stores the indicated type of enciphermentprocedure (B) at step S82. In addition, the radio access control unit ofthe mobile station requests at step S83 the security control unit of themobile station to read the encipherment key which was stored at stepS75. In response, the security control unit of the mobile stationnotifies the radio access control unit of the stored encipherment key atstep S84.

Then, the radio access control unit of the mobile station sends anencipherment response to the radio access control unit of the network atstep S85. The encipherment response indicates that the mobile stationwill encipher messages to be sent in accordance with the type ofencipherment procedure (B) selected at the network and the enciphermentkey prepared at the mobile station. Afterward, at step S86, the radioaccess control unit starts communication in such a manner that theencipherment is carried out. Upon the reception of the enciphermentresponse, at step S87, the radio access control unit of the networkstarts communication in such a manner that the encipherment is carriedout according to the type of encipherment procedure (B) and theencipherment key prepared at the network.

According to the above-described method, if the user of the mobilestation would like to select a level of security, it is possible toselect a suitable encipherment procedure or a suitable enciphermentprocedure and a suitable encipherment key preparation procedure.

In addition, it is possible for the mobile station or the network toselect a suitable encipherment procedure or a suitable encipherment keypreparation procedure for multimedia service, such as transmission ofvoice or motion pictures if the communications system permits totransmit them.

Furthermore, if it is necessary to improve encipherment in view offunction extension, such as a new service, of the mobile communicationssystem in the future, it will be easy to adopt a new suitableencipherment procedure or a new suitable encipherment key preparationprocedure.

Furthermore, if a plurality of mobile communications networks utilizeminimal encipherment manners in common, it is possible to communicateunder a suitable encipherment manner when mobile stations roam acrossservice areas of mobile communications networks. It is unnecessary thatvarious mobile communications networks utilize all of the enciphermentprocedures in common: each communications network can execute otherunique encipherment procedures.

3.3 Start of Diversity Handover Simultaneously With Access Link Setup

3.3.1 Background of Invention of the Procedure

Start of diversity handover and a setup of an access link are originallydifferent procedures from each other. Therefore, in a conventional usualmethod, when a mobile station starts communicating, an access link forthe mobile station is setup first. Then, when diversity handover isnecessary by travelling of the mobile station or another reason,diversity handover is carried out.

However, the mobile station often locates at the position wherediversity handover can be carried out when the access link is setup.Even in such a case, diversity handover transition and the access linksetup are carried out at different times in the conventional method.

For example, as represented in part (a) of FIG. 763, a base station 21has radio zones 11 and 12 and a mobile station 10 locates at a diversityhandover zone 13 where the radio zones 11 and 12 overlap each other. Inthis state, when a call attempt is originated to or from the mobilestation 10, an access link with minimal components for facilitatingcommunication of the mobile station 10 are setup. For example, a radioaccess link 41 is established between the mobile station 10 and the basestation 21 while a wired access link 51 is established between the basestation 21 and a base station controller 30. After finish of the accesslink setup, a step for transiting intra-cell diversity handover iscarried out: a radio access link 42 corresponding to the radio zone 12is added as represented in part (b) of FIG. 763.

Additionally, the mobile station often locates at the position whereinter-cell diversity handover can be carried out when the access link issetup. For example, as represented in part (a) of FIG. 764, the mobilestation 10 locates at a diversity handover zone 15 where radio zones 11and 14 corresponding to base stations 21 and 22 overlap each other. Inthis state, when a call attempt is originated to or from the mobilestation 10, an access link with minimal components for facilitatingcommunication of the mobile station 10 are setup. For example, a radioaccess link 41 corresponding to the radio zone 11 is established betweenthe mobile station 10 and the base station 21 while a wired access link51 is established between the base station 21 and a base stationcontroller 30. After finish of the access link setup, a step fortransiting inter-cell diversity handover is carried out: a radio accesslink 44 corresponding to the radio zone 14 is added and a wired accesslink 52 is additionally established between the base station 22 and thebase station controller 30.

As discussed above, although it is possible to carry out diversityhandover at the access link setup, these procedures are carried out atdifferent times: the access link setup should be carried out first, andthen diversity handover should be carried out in accordance with priorart.

The access link setup needs a series of information flows transportedbetween the mobile station and the network as illustrated in FIG. 765.In addition, in order to transit to intra-cell diversity handover,needed is a series of information flows transported between the mobilestation and the network as illustrated in FIG. 766. In addition, inorder to transit to inter-cell diversity handover, needed is a series ofinformation flows transported between the mobile station and the networkas illustrated in FIG. 767. The information flows shown in FIGS. 765 to767 have been already described and will be described for explanation ofthe invented control method. Thus, the description is omitted here.

According to the above circumstances, a large number of control signalsare transported between the mobile station and the network and withinthe network after the call attempt before diversity handover.Consequently, the system should endure its enormous control burden.

In addition, since the mobile station can use only a single radio accesslink directly after the access link setup, the transmission power forthis access link is strong so as to enlarge interference levels at otherradio access links. Therefore, the capacity or the number of channels atthe cell may be decreased. The control method described below willresolve the above-mentioned problems.

3.3.2 Outline of the Control Method of Embodiment

In the invented system, the network facilitates diversity handover of amobile station simultaneously with the access link setup for the mobilestation upon a call attempt to or from the mobile station when themobile station is in a status where it can carry out diversity handover.In addition, the mobile station starts diversity handover simultaneouslywith the access link setup. More specifically, upon the call attempt, atleast one auxiliary branch are established for facilitating diversityhandover in addition to the establishment of the main branch, therebyenabling the mobile station to commence the diversity handover using theplurality of branches.

Part (a) of FIG. 768 represents one feature of the invented system whichfor starting inta-cell diversity handover simultaneously with the accesslink setup. Part (b) of FIG. 768 represents one feature of the inventedsystem for starting inter-cell diversity handover simultaneously withthe access link setup.

3.3.2.1 Start of Intra-Cell Diversity Handover Simultaneously With theAccess Link Setup

FIG. 769 is a sequential flow diagram representing the start ofintra-cell diversity handover simultaneously with the access link setup.The procedure starts upon a call attempt to or from the mobile station10 when it locates at the position illustrated at part (a) of FIG. 768.

In FIG. 769, TACAFa designates a functional entity in the mobile station10 shown in part (a) of FIG. 768. TACFa designates an anchor functionalentity in the base station controller generated first after the mobilestation 10 has started communication. TACFv1 designates a functionalentity in the base station controller in order that the base stationcontroller controls the base station 21 where the mobile station 10visits. BCFr1 designates a functional entity in the base station 21 forcontrolling radio resources. The subject method will be described withreference to part (a) of FIG. 768 and FIG. 769.

As described above, each mobile station in the system always monitorsthe reception levels on perch channels corresponding to circumferentialzones. Thus, although the mobile station 10 visits the radio zone 11 inpart (a) of FIG. 768, it monitors the reception level on the perchchannel corresponding to the radio zone 12 neighboring the zone 11.

Assume that the reception level on the perch channel corresponding tothe radio zone 12 is in excess of a threshold. In this case, the mobilestation 10 notifies the network that the perch channel corresponding tothe radio zone 12 is a candidate branch for realizing diversityhandover.

In addition, assume that the mobile station locates at the diversityhandover zone 13, that the network is informed about a new candidatezone for diversity handover, and that the mobile station 10 originates acall attempt. In this case, when the base station controller 30 decidesto establish diversity handover branches for the mobile station 10, thebase station controller 30 generates an access link setup request and adiversity handover transition request for the mobile station 10 at thesame time. According to the requests, the following steps are advancedin the system.

(1) First, in order to establish an access link for the mobile station10, the functional entity TACFa in the base station controller 30 sendsa BEARER SETUP REQUEST INDICATION (ACCESS LINK SETUP request indication)to the functional entity TACFv in the base station controller 30 thatcontrols the base station 21 where the mobile station 10 visits. TheBEARER SETUP request indication includes information elementsrepresented in FIGS. 404 and 433.

(2) Upon the reception of the BEARER SETUP request indication, thefunctional entity TACFv1 sends a message that includes contents of aBEARER-AND-RADIO-BEARER SETUP request indication and contents of anINTRA-BCFr HANDOVER BRANCH ADDITION request indication to the functionalentity BCFr in base station 21. Contents of the BEARER-AND-RADIO-BEARERSETUP request indication are the same as those represented in FIG. 407.The BEARER-AND-RADIO-BEARER SETUP request indication requests to setupthe main branch constituted of the radio access link 41 between the basestation 21 and the mobile station 10 and the wired access link 51between the base station 21 and the base station controller 30. TheINTRA-BCFr HANDOVER BRANCH ADDITION request indication requests to setupthe auxiliary branch for intra-cell diversity handover. That is, itrequests to setup the radio access link 42 represented in part (a) ofFIG. 768. Contents of the INTRA-BCFr HANDOVER BRANCH ADDITION requestindication are the same as those represented in FIG. 434.

The message including the contents of the BEARER-AND-RADIO-BEARER SETUPrequest indication and the INTRA-BCFr HANDOVER BRANCH ADDITION requestindication is the link setup message, which has been described atsection 2.5.3.6.2.1.3.2. Contents of the link setup message arerepresented in FIG. 693, which has been referred for the description atsection 2.5.3.6.2.1.3.2. As represented in FIG. 693, the messageincludes an ACCH setup request information element for requesting theaccess link and an intra-BS DHO branch addition request informationelement indicating information on the auxiliary branch to be added fordiversity handover.

(3) Next, BCFr sends a message including contents of a RADIO BEARERSETUP PROCEEDING request indication and contents of an INTRA-BCFrHANDOVER BRANCH ADDITION response confirmation to TACFv1. The RADIOBEARER SETUP PROCEEDING request indication is a report indicating thatthe radio access link (41 in part (a) of FIG. 768) is being established.Contents of the RADIO BEARER SETUP PROCEEDING request indication are thesame as those represented in FIG. 408. The INTRA-BCFr HANDOVER BRANCHADDITION response confirmation is a report indicating that the setup ofthe radio access link 42 has been completed. Contents of the INTRA-BCFrHANDOVER BRANCH ADDITION response confirmation are the same as thoserepresented in FIG. 435.

(4) Upon the reception of the RADIO BEARER SETUP PROCEEDING requestindication and the INTRA-BCFr HANDOVER BRANCH ADDITION responseconfirmation from BCFr1, TACFv1 sends a RADIO BEARER SETUP REQUESTrequest indication to TACFa to request the mobile station 10 toestablish the radio access links 41 and 42. The RADIO BEARER SETUPREQUEST request indication includes information elements represented inFIGS. 409 and 436.

(5) Then, TACFa in the base station controller 30 sends a messageincluding contents of a HANDOVER BRANCH ADDITION request indication andcontents of a RADIO BEARER SETUP request indication to TACAF of themobile station 10. The message requests to establish the radio accesslink 41, which belongs to the main branch which will be the subject ofsynchronization later, and the radio access link 42, which is theauxiliary link for diversity handover. The message is the radio bearersetup message, which has been described at section 2.5.2.4.2.3.4.1.Contents of the radio bearer setup message are represented in FIG. 624,which has been referred for the description at section 2.5.2.4.2.3.4.1.As represented in FIG. 624, the message includes information on the mainbranch and a DHO branch addition information indicating information onthe auxiliary branch to be added for diversity handover.

(6) Subsequently, TACAFa in the mobile station 10 starts to synchronizeprocess of the TACAFa with process of BCFr1 in the base station withrespect to the radio access link of the main branch.

(7) After completion of the synchronization, BCFr1 in the base station21 sends a BEARER-AND-RADIO-BEARER SETUP response confirmation to TACFv1in the base station controller 30 to report the completion of thesynchronization on the radio access link. FIG. 413 represents thecontents of the BEARER-AND-RADIO-BEARER SETUP response confirmation.

(8) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP responseconfirmation, TACFv1 sends a BEARER SETUP response confirmation to TACFain order to report the completion of the access link setup. FIG. 414represents the contents of the BEARER SETUP response confirmation.

Consequently, the access link setup is established and the system stateis transited to diversity handover.

3.3.2.2 Start of Inter-Cell Diversity Handover Simultaneously With theAccess Link Setup

FIG. 770 is a sequential flow diagram representing the start ofinter-cell diversity handover simultaneously with the access link setup.The procedure starts upon a call attempt to or from the mobile station10 when it locates at the position illustrated at part (b) of FIG. 768.

In FIG. 770, TACAFa designates a functional entity in the mobile station10 shown in part (b) of FIG. 768. TACFa designates a functional entityin the base station controller generated first after the mobile station10 has started communication. TACFv1 and TACFv2 designate functionalentities in the base station controller in order that the base stationcontroller controls the base stations 21 and 22 where the mobile station10 visits. BCFr1 and BCFr2 designate functional entities in the basestations 21 and 22 for controlling radio resources. The subject methodwill be described with reference to part (b) of FIG. 768 and FIG. 769.

As represented in part (b) of FIG. 768, assume that when the mobilestation 10 moves into the diversity handover zone 13, the mobile station10 originates a call attempt. In this case, the base station controller30 generates an access link setup request and a diversity handovertransition request for the mobile station 10 at the same time. Accordingto the requests, the following steps are advanced in the system.

(1) First, in order to establish an access link for the mobile station10, TACFa in the base station controller 30 sends a BEARER SETUP requestindication (ACCESS LINK SETUP request indication) to TACFv1 in the basestation controller 30. The contents of the BEARER SETUP requestindication are represented in FIG. 404.

(2) Upon the reception of the BEARER SETUP request indication, TACFv1sends a BEARER-AND-RADIO-BEARER SETUP request indication to request toestablish the radio access link 41 between the base station 21 and themobile station 10 and to establish the wired access link between thebase station 21 and the base station controller 30. Contents of theBEARER-AND-RADIO-BEARER SETUP request indication are represented in FIG.407.

(3) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP requestindication, BCFr1 starts to establish the radio access link and thewired access link and sends a RADIO BEARER SETUP PROCEEDING requestindication to TACFv1 to report that the radio access link. Contents ofthe RADIO BEARER SETUP PROCEEDING request indication are represented inFIG. 404.

(4) Upon the reception of the RADIO BEARER SETUP PROCEEDING requestindication, TACFv1 in the base station controller 30 sends a RADIOBEARER SETUP REQUEST request indication to TACFa to request the mobilestation 10 to establish the radio access link 41 while the base station21 establishes the radio access link 41. The RADIO BEARER SETUP REQUESTrequest indication includes information elements represented in FIGS.409.

(5) Next, TACFa in the base station controller 30 sends a BEARER SETUPrequest indication (ACCESS LINK SETUP request indication) to thefunctional entity TACFv2 in the base station controller 30 that controlsthe base station 22 where the mobile station 10 visits. The BEARER SETUPrequest indication includes information elements represented in FIG.442.

(6) Upon the reception of the BEARER SETUP request indication, TACFv2sends a BEARER-AND-RADIO-BEARER SETUP request indication to request toestablish the radio access link 44 between the base station 22 and themobile station 10 and to establish the wired access link between thebase station 22 and the base station controller 30. Contents of theBEARER-AND-RADIO-BEARER SETUP request indication are represented in FIG.445.

(7) After completion of the setup of the radio access link and the wiredaccess link, BCFr2 in the base station 22 sends aBEARER-AND-RADIO-BEARER SETUP response confirmation represented in FIG.446 to TACFv2 in the base station controller 30 to notify of thecompletion.

(8) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP responseconfirmation, TACFv2 sends a RADIO BEARER SETUP REQUEST requestindication represented in FIG. 447 to TACFa in order to request themobile station 10 to establish the radio access link 44.

(9) Upon the reception of the RADIO BEARER SETUP REQUEST requestindication, TACFa sends a message including contents of a HANDOVERBRANCH ADDITION request indication and contents of a RADIO BEARER SETUPrequest indication to TACAF of the mobile station 10. The messagerequests to establish the radio access link 41, which belongs to themain branch which will be the subject of synchronization later, and theradio access link 44, which is the auxiliary link for diversityhandover.

(10) Subsequently, the mobile station 10 starts to synchronize processof the mobile station with process of the base station 21 with respectto the radio access link 41 of the main branch.

(11) After completion of the synchronization, BCFr1 in the base station21 sends a BEARER-AND-RADIO-BEARER SETUP response confirmation to TACFv1in the base station controller 30 to report the completion of thesynchronization on the radio access link. FIG. 413 represents thecontents of the BEARER-AND-RADIO-BEARER SETUP response confirmation.

(12) Then, TACFv1 sends a BEARER SETUP response confirmation (ACCESSLINK SETUP response confirmation) to TACFa in order to report thecompletion of the access link setup. FIG. 414 represents the contents ofthe BEARER SETUP response confirmation.

Consequently, the access link setup is established and the system stateis transited to diversity handover.

3.3.3 Operations of Mobile Station and Base Station for the ControlMethod

3.3.3.1 Operation of Mobile Station

FIG. 786 represents in detail the operation in FIG. 770. Morespecifically, it particularly represents the operation after thetransmission of the message including the contents of the HANDOVERBRANCH ADDITION request indication and of the RADIO BEARER SETUP requestindication from TACFa of the base station controller to TACAF of themobile station.

As represented in FIG. 786, upon the reception of the HANDOVER BRANCHADDITION request indication and the RADIO BEARER SETUP requestindication, TACAFa establishes the main branch. More specifically, themobile station allots physical resources (frequency and codes) for radiocommunication to a radio transceiver device of the mobile station, andthen, synchronize process of the mobile station with process of BCFr1 ofthe base station with respect to upward (reverse) communication anddownward (forward) communication. After completion of thesynchronization, voice or data communication is started.

Immediately after the completion of setup of the main branch in theabove-described fashion, the mobile station sets up the auxiliarybranch. In this case, the mobile station allots physical resources forthe auxiliary branch. Immediately afterward, the mobile station startsto receive signals through the auxiliary branch, thereby commencingdiversity combining by virtue of the main and auxiliary branches withoutsynchronization unlike the main branch setup.

FIG. 787 is a flowchart of an operation of the mobile station, which isappropriate to realizing the above-mentioned operation. Morespecifically, this flowchart represents an operation for processing inthe mobile station after receiving a message including both of the setuprequest of the main branch and the additional setup request of theauxiliary branch from the base station controller when any access linkis not established.

As represented in the flowchart, upon the reception of a signal at stepS1, the mobile station transits from the signal reception standby stateto step S2. At step S2, the mobile station determines whether or not thereceived signal contains information on the main branch. If thedetermination is affirmative, the mobile station establishes the mainbranch at step S3 in accordance with the main branch information.

Next, the mobile station determines whether or not the received signalcontains information on the auxiliary branch at step S4. If thedetermination is affirmative, the mobile station establishes theauxiliary branch at step S5 in accordance with the auxiliary branchinformation. As represented by the circulation through steps S4 and S5,if a plurality of auxiliary branches are indicated by the receivedsignal, the mobile station establishes all of the auxiliary branches inaccordance with the information.

If there is not a next indication of auxiliary branch in the receivedsignal, the determination at step S4 should be negative, so that themobile station returns to the signal reception standby state.

As will be understood from the above description, if the mobile stationreceives a message including both of the setup request of the mainbranch and the additional setup request(s) of the auxiliary branch(es),it establishes all of the branches informed by the message. Thisoperation contributes the operation represented in FIG. 786 for startingdiversity handover simultaneously with the access link setup. Althoughthe above-description with reference to FIGS. 786 and 787 relates tointer-cell diversity handover with the access link setup, similaroperations can be applied to intra-cell diversity handover with theaccess link setup.

For easy comparison, FIG. 788 represents a conventional operation of amobile station after the access link setup while FIG. 789 represents aconventional flowchart of an operation for realizing the access linksetup. As represented in FIG. 788, according to the prior art, a RADIOBEARER SETUP request indication is sent from the base station controllerto the mobile station in order to establish the first access link, andthen, a HANDOVER BRANCH ADDITION request indication is sent from thebase station controller to the mobile station in order to startdiversity handover. In other words, an extra message transmission fromthe base station controller to the mobile station is necessary incomparison with the invented system.

Furthermore, since the RADIO BEARER SETUP request indication and theHANDOVER BRANCH ADDITION request indication are sent to the mobilestation at different times according to the prior art, the mobilestation treats received signals according to the flowchart representedin FIG. 789. As represented in the flowchart, upon the reception of asignal at step S11, the mobile station transits from the signalreception standby state to step S12. As depicted by steps S12 and S13,if the signal contains information on the main branch, the mobilestation establishes the main branch in accordance with the main branchinformation. On the other hand, if the signal contains information onthe auxiliary branch, the mobile station establishes the auxiliarybranch in accordance with the auxiliary branch information as depictedby steps S12 and S14.

Unlikely, according to the invented system, one message includinginformation on all of the main branch and auxiliary branch(es) is sentto the mobile station, so that the mobile station establishes allbranches. Therefore, the number of signal transmission between thenetwork and the mobile station can be reduced, so that the transition todiversity handover can be achieved efficiently.

3.3.3.2. Operation of Base Station

As already described with reference to FIG. 769, in order to transitintra-cell diversity handover simultaneously with the access link setup,the message including the contents of the BEARER-AND-RADIO BEARER SETUPrequest indication and INTRA-BCFr HANDOVER BRANCH ADDITION requestindication is sent to the base station in the system. The base stationin the system reads the information on all of the branches contained inthe message and establishes all branches in accordance with the branchinformation. If this operation is represented as in a flowchart, it isthe same as FIG. 787. Therefore, the illustration of flowchart and thedescription thereof are omitted.

3.4 Diversity Handover Branch Addition Simultaneously With BranchReplacement

3.4.1 Background of Invention of the Procedure

When a mobile station moves from a radio zone to a neighboring radiozone where the available frequency band is different from that of theformer zone, branch replacement is carried out. Branch replacement isalso carried out to replace the frequency band used by the mobilestation with another frequency band if communication quality isdeteriorated although the mobile station does not move.

In accordance with prior art, transition to diversity handover is oftennecessary immediately after the completion of branch replacement. FIG.771 represents one of the situations where it is necessary. Asrepresented in FIG. 771, while frequency band f1 is used in cell 1,frequency band f2 is used in cell 2. Assume that a mobile station movesalong the direction indicated by the arrow into the zone where cells 1,2, and 3 overlap one another. In this case, when the mobile stationquits cell 1, branch replacement is carried out at the diversityhandover zone where cells 2 and 3 overlap each other.

In accordance with prior art, first, the branch corresponding to cell 1used by the mobile station is replaced with the branch corresponding tocells 2 and 3, and then, another branch corresponding to cell 3 is addedfor enabling diversity handover.

However, the branch replacement needs a series of information flowstransported between the mobile station and the network as illustrated inFIG. 772. In addition, in order to transit to diversity handover, neededis a series of information flows transported between the mobile stationand the network as illustrated in FIG. 767. The information flows shownin FIGS. 772 and 767 have been already described and will be describedfor explanation of the invented control method. Thus, the description isomitted here.

According to the above circumstances, a large number of control signalsare transported between the mobile station and the network and withinthe network for the branch replacement and the diversity handover inprogression. Consequently, the system should endure its enormous controlburden.

In addition, since the mobile station can use only a single radio accesslink directly after the branch replacement, the transmission power forthis access link is strong so as to enlarge interference levels at otherradio access links. Therefore, the capacity or the number of channels atthe cell may be decreased.

The above-mentioned problems occur at the situation where the transitionto inter-cell diversity handover is possible after the branchreplacement as represented in FIG. 771. The same problems occur at thesituation where the transition to intra-cell diversity handover ispossible after the branch replacement. The control method describedbelow will resolve the above-mentioned problems.

3.4.2 Diversity Handover Branch Addition Simultaneously With BranchReplacement of Embodiment

According to the embodiment of the system, when it is possible transitto diversity handover at the occurrence of the initiation to branchreplacement, the branch structure before the initiation is immediatelyreplaced with the branch structure necessary for diversity handover.FIG. 773 is a sequential flow diagram representing an operation in theinvented system which is carried out when the mobile station moves fromcell 1 to the diversity handover zone where cells 2 and 3 overlap eachother (see FIG. 771).

In FIG. 773, TACAFa designates a functional entity in the mobile stationshown in FIG. 771. TACFa designates a functional entity in the basestation controller generated first after the mobile station has startedcommunication. TACFv1, TACFv2, and TACFv3 designate functional entitiesin the base station controller in order that the base, stationcontroller controls base stations where the mobile station 10 visits. Inthe example in FIG. 771, TACFv1, TACFv2, and TACFv3 correspond to cells1, 2, and 3, respectively. BCFr1, BCFr2, and BCFr3 designate functionalentities in the base stations for controlling radio resources. In theexample in FIG. 771, BCFr1, BCFr2, and BCFr3 correspond to cells 1, 2,and 3, respectively. The subject method will be described with referenceto FIGS. 771 and 773.

In FIG. 771, assume that when the mobile station enters the diversityhandover zone where cells 1, 2, and 3 overlap one another, the mobilestation notifies the network that the cells 2 and 3 are candidate cellsfor realizing diversity handover and the network recognizes that cells 2and 3 are candidate cells. In addition, assume that the mobile stationexits cell 1 and moves into the diversity handover zone where cells 2and 3 overlap each other. In this case, the base station controllergenerates a branch replacement request and a diversity handovertransition request for the mobile station at the same time. According tothe requests, the following steps are advanced in the system.

(1) TACAFa in the base station controller sends a BEARER SETUP requestindication to TACFv2 in the base station controller in order toestablish a branch between the base station controller and the mobilestation through the base station in charge of cell 2.

(2) Upon the reception of the BEARER SETUP request indication, TACFv2sends a BEARER-AND-RADIO-BEARER SETUP request indication to BCFr2 in thebase station in charge of cell 2. The BEARER-AND-RADIO-BEARER SETUPrequest indication requests to establish a radio access link between thebase station in charge of cell 2 and the mobile station and a wiredaccess link between the base station and the base station controller.

(3) After starting the establishment of the radio and wired access linksupon the reception of the BEARER-AND-RADIO-BEARER SETUP requestindication, BCFr2 of the base station for cell 2 sends a RADIO BEARERSETUP PROCEEDING request indication to TACFv2 in the base stationcontroller to report that the access link setup is proceeding.

(4) Upon the reception of the RADIO BEARER SETUP PROCEEDING requestindication, TACFv2 sends a RADIO BEARER SETUP REQUEST request indicationto TACFa to request the mobile station to establish the radio accesslink between the mobile station and the base station for cell 2.

(5) Upon the reception of the RADIO BEARER SETUP REQUEST requestindication, TACFa sends another BEARER SETUP request indication toTACFv3 to request to establish another branch between the base stationcontroller and the mobile station through the base station in charge ofcell 3.

(6) Upon the reception of the BEARER SETUP request indication, TACFv3sends another BEARER-AND-RADIO-BEARER SETUP request indication to BCFr3in the base station in charge of cell 3. The BEARER-AND-RADIO-BEARERSETUP request indication requests to establish a radio access linkbetween the base station in charge of cell 3 and the mobile station anda wired access link between the base station and the base stationcontroller.

(7) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP requestindication, BCFr3 of the base station for cell 3 starts theestablishment of the radio and wired access links, and then, sendsanother RADIO BEARER SETUP PROCEEDING request indication to TACFv3 inthe base station controller to report that the access link setup isproceeding.

(8) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP responseconfirmation, TACFv3 sends a RADIO BEARER SETUP REQUEST requestindication to TACFa to request the mobile station to establish the radioaccess link between the mobile station and the base stations for cells 2and 3.

(9) Upon the reception of the RADIO BEARER SETUP REQUEST requestindication, TACFa sends a message including contents of a NON-SOFTHANDOVER EXECUTION request indication and of a HANDOVER BRANCH ADDITIONrequest indication to TACAfa in the mobile station. The NON-SOFTHANDOVER EXECUTION request indication requests the replacement of mainbranch while the HANDOVER BRANCH ADDITION request indication requests toadd an auxiliary branch. With such constituents, the message requeststhe mobile station to replace a former branch corresponding to cell 1where frequency f1 is used with a new branch corresponding to cell 2where frequency f2 is used, and requests the mobile station to add anauxiliary branch corresponding to cell 3 where frequency f2 is used. Themessage is the handover command message, which has been described atsection 2.5.2.4.2.3.4.4. Contents of the message are represented in FIG.627, which has been referred for the description at section2.5.2.4.2.3.4.4. As represented in FIG. 627, the message includes abranch replacement information element indicating information on the newmain branch and a DHO branch addition information element indicatinginformation on the auxiliary branch to be added for diversity handover.

(10) Subsequently, the mobile station starts to synchronize process ofthe mobile station with process of the base station for cell 2 withrespect to the main branch.

(11) After completion of the synchronization, BCFr2 in the base stationfor cell 2 sends a BEARER-AND-RADIO-BEARER SETUP response confirmationto TACFv2 in the base station controller to report the completion of thesynchronization on the radio access link.

(12) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP responseconfirmation, TACFv2 sends a BEARER SETUP response confirmation to TACFain order to report the completion of the access link setup.

(13) Upon the reception of the BEARER SETUP response confirmation, TACFain the base station controller sends a BEARER RELEASE request indicationto TACFv1 to request to release the access link formerly used by thebase station for cell 1 for communicating with the mobile station.

(14) Upon the reception of the BEARER RELEASE request indication, TACFv1sends a BEARER-AND-RADIO-BEARER RELEASE request indication to BCFr1 inthe base station for cell 1 to request to release the radio access linkand wired access link formerly used by the base station for cell 1 forcommunicating with the mobile station.

(15) Upon the reception of the BEARER-AND-RADIO-BEARER RELEASE requestindication, BCFr1 in the base station for cell 1 releases the radioaccess link and wired access link formerly used by the base station forcell 1 for communicating with the mobile station, and sends aBEARER-AND-RADIO-BEARER RELEASE response confirmation to TACFv1 toreport the completion of access link release.

(16) Upon the reception of the BEARER-AND-RADIO-BEARER RELEASE responseconfirmation, TACFv1 in the base station sends a BEARER RELEASE responseconfirmation to TACFa to report the completion of access link release.

Therefore, the mobile station can transit to diversity handover usingbranches corresponding to cells 2 and 3.

An operation of the system when the mobile station can carries outinter-cell diversity handover directly after the branch replacement hasbeen described with reference to FIGS. 771 and 773. A similar operationis executed for the case when the mobile station can carries outintra-cell diversity handover directly after the branch replacement. Inthis case, the base station controller sends a single message includinginformation instructing the branch replacement and informationinstructing the diversity handover branch addition to the single basestation in charge of intra-cell diversity handover.

3.4.3 Operations of Mobile Station and Base Station for the ControlMethod

3.4.3.1 Operation of Mobile Station

As described above, a message including an instruction on the branchreplacement and an instruction on the addition of auxiliary branch fordiversity handover is sent to the mobile station in the system.Therefore, when the mobile station receives this kind of message fromthe network, the mobile station carries out the branch replacement andthe addition of auxiliary branch for diversity handover. In this case,the same operation as described in section 3.3.3.1 is carried out.

3.4.3.2 Operation of Base Station

As described above, a message including an instruction on the branchreplacement and an instruction on the addition of auxiliary branch forintra-cell diversity handover is sent to the base station in the system.Therefore, when the base station receives this kind of message from thenetwork, the base station carries out the branch replacement and theaddition of auxiliary branch for diversity handover.

3.5 First Method for Controlling Branch Structure and Frequency BandWhen a new Call Occurs While Mobile Station Capable of Treating aPlurality of Calls Simultaneously Treats an Existent Call

3.5.1 Background of Invention of the Method

There is provided a mobile station capable of treating a plurality ofcalls simultaneously. In accordance with prior art, this kind of mobilestation is not provided with means for equalizing branch structure andfrequency band as to all calls. Different branch structures anddifferent frequency bands are sometimes allocated to calls while themobile station treats them. Thus, it is necessary for the network tocontrol respective calls with regard to handover of mobile station andtransmission power, so that the network should endure an enormous burdenwith respect to preparation of overheads of messages. The control methoddescribed below will resolve the above-mentioned problems.

3.5.2 Embodying Method

As represented in part (a) of FIG. 774, BTS1 and BTS2 have radio zones,respectively, where frequency f1 is used. The MS treating call 1communicates with BTS1 and BTS2 such that diversity reception from BTS1and BTS2 is carried out at the diversity handover transition state. Inthis state, assume that a new call attempt occurs to or from the MS.

In this case, the branch structure and the frequency band used for thenew call (call 2 in FIG. 774) are controlled to be equalized with thoseused for the existent call (call 1 in FIG. 774) in the system. Morespecifically, a frequency band f1 has been used for existent call 1 andbranches corresponding to BTS1 and BTS2 have been used for call 1 asrepresented in part (a) of FIG. 774. Therefore, upon the occurrence ofnew call 2, the frequency band f1 is also used and branchescorresponding to BTS1 and BTS2 are also used for call 2 in part (b) ofFIG. 774.

FIG. 775 is a sequential flow diagram representing the operationexemplified in FIG. 774 of the system. In FIG. 775, TACAFa designates afunctional entity in the MS shown in FIG. 774. TACFa designates afunctional entity in the base station controller generated first afterthe MS has started communication. TACFv1 and TACFv2 designate functionalentities in the base station controller in order that the base stationcontroller controls BTS1 and BTS2 where the MS visits. BCFr1 and BCFr2designate functional entities in BTS1 and BTS2, respectively, forcontrolling radio resources. The subject method will be described withreference to FIGS. 774 and 775.

If new call 2 occurs to or from the MS while the MS treats existent call1 such that diversity reception from BTS1 and BTS2 is carried out at thediversity handover transition state as represented in part (a) of FIG.774, TACFa in the base station controller receives a request forestablishing a new access link corresponding to new call 2 and a requestfor equalizing the branch structure for call 2 with that for call 1.According to the requests, the following steps are advanced in thesystem.

(1) In order to request to establish an access link for new call 2 viaBTS1 where the MS visits, TACFa sends a BEARER SETUP request indicationto TACFv1 in the base station controller, which controls BTS1.

(2) Upon the reception of the BEARER SETUP request indication, TACFv1sends a BEARER-AND-RADIO-BEARER SETUP request indication to BCFr1 inBTS1 to request to establish a radio access link between BTS1 and the MSand a wired access link between BTS1 and the base station controller fornew call 2.

(3) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP requestindication, BCFr1 in BTS1 starts establishing the requested radio andwired access links, and then, sends a RADIO BEARER SETUP PROCEEDINGrequest indication to TACFv1 in the base station controller to reportthat the access link setup is proceeding.

(4) Upon the reception of the RADIO BEARER SETUP PROCEEDING requestindication, TACFv1 sends a RADIO BEARER SETUP REQUEST request indicationto TACFa to request to establish the radio access link between the MSand BTS1.

(5) On the other hand, in order to request to establish an access linkfor new call 2 via BTS2, TACFa sends another BEARER SETUP requestindication to TACFv2 in the base station controller, which controlsBTS2.

(6) Upon the reception of the BEARER SETUP request indication, TACFv2sends a BEARER-AND-RADIO-BEARER SETUP request indication to BCFr2 inBTS2 to request to establish another radio access link between BTS2 andthe MS and another wired access link between BTS2 and the base stationcontroller.

(7) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP requestindication, BCFr2 in BTS2 establishes the requested radio and wiredaccess links, and then, sends a BEARER-AND-RADIO-BEARER SETUP responseconfirmation to TACFv2 in the base station controller to report that theaccess link setup is completed.

(8) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP responseconfirmation, TACFv2 sends a RADIO BEARER SETUP REQUEST requestindication to TACFa to request to establish the radio access linkbetween the MS and BTS2.

(9) By this stage, TACFa has received two RADIO BEARER SETUP REQUESTrequest indications: the first is sent from TACFv1 to request theestablishment of the radio access link between the MS and BTS1, and thesecond is sent from TACFv2 to request the establishment of the radioaccess link between the MS and BTS2. Upon the reception of the secondRADIO BEARER SETUP REQUEST request indication from TACFv2, TACFa sends asingle message including contents of a HANDOVER BRANCH ADDITION requestindication and of a RADIO BEARER SETUP request indication to TACAFa inthe MS. The RADIO BEARER SETUP request indication is used for requestingto establish the main branch, which will be the subject ofsynchronization later, via BTS1. The HANDOVER BRANCH ADDITION requestindication is used for establishing the auxiliary branch via BTS2 fordiversity handover. Thus, the message requests the MS to establish theradio access link of the main branch via BTS1 and the radio access linkof the auxiliary branch via BTS2 for new call 2.

(10) Subsequently, the MS starts to synchronize process of the MS withprocess of the BTS1 with respect to the radio access link of the mainbranch.

(11) After completion of the synchronization, BCFr1 in BTS1 sends aBEARER-AND-RADIO-BEARER SETUP response confirmation to TACFv1 in thebase station controller to report the completion of the synchronizationon the radio access link.

(12) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP responseconfirmation, TACFv1 sends a BEARER SETUP response confirmation to TACFain order to report the completion of the access link setup.Consequently, the MS can use the same diversity handover branches viaBTS1 and BTS2 and can use the same frequency f1 for both calls 1 and 2.

3.6 Second Method for Controlling Branch Structure and Frequency BandWhen a new Call Occurs While Mobile Station Capable of Treating aPlurality of Calls Simultaneously Treats an Existent Call

3.6.1 Background of Invention of the Method

In the above control method described at section 3.5, the branchstructure and the frequency band for the new call are equalized withthose for the existent call when the new call attempt occurs duringcommunication by the mobile station.

However, if traffic at at least one of the branches or at the frequencyused for the existent call is congested or another inconvenientsituation happen at the occurrence of the new call attempt, it isimpossible to allocate the same branch structure or the frequency bandto the new call. In this case, the call attempt cannot be accepted. Thecontrol methods described below will resolve the above-mentionedproblems.

3.6.2 Embodying Methods

The control methods according to embodiments of the invention is carriedout when a new call occurs while the mobile station capable of treatinga plurality of calls simultaneously treats an existent call and when itis impossible to assign the same branch structure or the same frequencyband as for the existent call to the new call by insufficient capacityor another reason. In accordance with the embodiments, at theestablishment of the new call, another branch structure or anothercommunication frequency band which can continue both of the existent andnew calls is selected, and the selected branch structure orcommunication frequency band is assigned to both of the existent and newcalls.

FIG. 776 represents one of the methods according to the embodiments. Inpart (a) of FIG. 776, an MS uses a branch at frequency f1 between BTS1and the MS, thereby treating call 1. Then, an attempt of new call 2occurs from the MS. However, assume that the capacity of BTS1 isinsufficient for the needs of new call 2.

However, the capacity of BTS2 adjacent to BTS1 is sufficient for theneeds of calls 1 and 2. In addition, BTS2 uses the same frequency bandf1 as of BTS1. If a diversity branch structure including branches viaBTS1 and BTS2 is used for call 1, the transmission power for each branchmay be reduced and the capacity of BTS1 can be enhanced to afford call 2newly.

Accordingly, in the embodying method, the former branch structure forcall 1 is replaced with the diversity branch structure includingbranches via BTS1 and BTS2 at the establishment of call 2 as representedin part (b) of FIG. 776. The same branch structure and the samefrequency band are allocated to new call 2.

FIG. 777 represents another method according to another embodiment. Inpart (a) of FIG. 777, an MS uses a branch at frequency f1 between BTS1and the MS, thereby treating call 1. Then, an attempt of new call 2occurs from the MS. However, assume that the capacity of BTS1 isinsufficient for the needs of new call 2.

However, the capacity of BTS2 adjacent to BTS1 is sufficient for theneeds of calls 1 and 2. However, BTS2 uses a frequency band f2, which isdifferent from that of BTS1, so that the MS cannot conduct diversityreception by BTS1 and BTS2.

Accordingly, in the embodying method, the former branch structure forcall 1 is replaced with another branch structure constituted of only thesingle branch via BTS2 at the establishment of call 2 as represented inpart (b) of FIG. 777. The same branch structure and the same frequencyband are allocated to new call 2.

FIG. 778 is a sequential flow diagram representing the operationexemplified in FIG. 776 of the system. In FIG. 778, TACAFa designates afunctional entity in the MS shown in FIG. 776. TACFa designates afunctional entity in the base station controller generated first afterthe MS has started communication. TACFv1-2 designates an instance of afunctional entity in the base station controller in order that the basestation controller controls BTS1 where the MS visits. TACFv1-2corresponds to call 1. TACFv2-1 and TACFv2-2 designate instances offunctional entities in the base station controller in order that thebase station controller controls BTS2 where the MS visits. TACFv2-1 andTACFv2-2 correspond to calls 1 and 2, respectively. BCFr1-2 designatesan instance of a functional entity in BTS1 for controlling radioresources. BCFr1-2 corresponds to call 1. BCFr2-1 and BCFr2-2 designateinstances of functional entities in BTS2 for controlling radioresources. BCFr2-1 and BCFr2-2 correspond to calls 1 and 2,respectively. The subject method will be described with reference toFIGS. 776 and 778.

If new call 2 occurs to or from the MS while the MS treats existent call1 using BTS1 as represented in part (a) of FIG. 776, TACFa in the basestation controller ascertains radio resources occupied by existent call1 and all available radio resources in all of the base stations (BTS1and BTS2 in FIG. 776) where the MS visits.

Then, TACFa determines how to treat all calls, including the new call,for the MS on the basis of the ascertainment. In other words, TACFa inthe base station controller determines to allocate the branch structureconstituted of the branch between the MS and BTS1 and the branch betweenthe MS and BTS2 to calls 1 and 2 as described above with reference topart (b) of FIG. 776. According to the determination, the followingsteps are advanced in the system.

(1) In order to request to establish an access link for new call 2 viaBTS1 where the MS visits, TACFa sends a BEARER SETUP request indicationto TACFv1-2 in the base station controller, which controls BTS1.

(2) Upon the reception of the BEARER SETUP request indication, TACFv1-2sends a BEARER-AND-RADIO-BEARER SETUP request indication to BCFr1-2 inBTS1 to request to establish a radio access link between BTS1 and the MSand a wired access link between BTS1 and the base station controller forcall 2.

(3) Additionally, TACFa in the base station controller sends anotherBEARER SETUP request indication to TACFv2-1 in the base stationcontroller, which controls BTS2 in order to request to establish anaccess link for existent call 1 via BTS2 where the MS visits.

(4) Upon the reception of the BEARER SETUP request indication, TACFv2-1sends another BEARER-AND-RADIO-BEARER SETUP request indication toBCFr2-1 in BTS2 to request to establish another radio access linkbetween BTS2 and the MS and another wired access link between BTS2 andthe base station controller for call 1.

(5) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP requestindication from TACFv1-2, BCFr1-2 in BTS1 starts establishing therequested radio and wired access links, and then, sends a RADIO BEARERSETUP PROCEEDING request indication to TACFv1-2 in the base stationcontroller to report that the access link setup is proceeding.

(6) Upon the reception of the RADIO BEARER SETUP PROCEEDING requestindication, TACFv1-2 sends a RADIO BEARER SETUP REQUEST requestindication to TACFa to request to establish the radio access link fornew call 2 between the MS and BTS1.

(7) On the other hand, upon the reception of the BEARER-AND-RADIO-BEARERSETUP request indication from TACFv2-1, BCFr2-1 in BTS2 startsestablishing the requested radio and wired access links, and then, sendsa BEARER-AND-RADIO-BEARER SETUP PROCEEDING request indication toTACFv2-1 in the base station controller to report that the access linksetup is proceeding.

(8) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP PROCEEDINGrequest indication, TACFv2-1 sends a RADIO BEARER SETUP REQUEST requestindication to TACFa to request to establish the radio access link forexistent call 1 between the MS and BTS2.

(9) In addition, TACFa in the base station controller sends anotherBEARER SETUP request indication to TACFv2-2 in the base stationcontroller, which controls BTS2 in order to request to establish anaccess link for new call 2 via BTS2 where the MS visits.

(10) Upon the reception of the BEARER SETUP request indication, TACFv2-2sends another BEARER-AND-RADIO-BEARER SETUP request indication toBCFr2-2 in BTS2 to request to establish another radio access linkbetween BTS2 and the MS and another wired access link between BTS2 andthe base station controller for new call 2.

(11) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP requestindication, BCFr2-2 in BTS2 starts establishing the requested radio andwired access links, and then, sends another BEARER-AND-RADIO BEARERSETUP PROCEEDING request indication to TACFv2-2 in the base stationcontroller to report that the access link setup is proceeding.

(12) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP responseconfirmation, TACFv2-2 sends a RADIO BEARER SETUP REQUEST requestindication to TACFa to request to establish the radio access link forcall 2 between the MS and BTS2.

(13) By this stage, TACFa has received three RADIO BEARER SETUP REQUESTrequest indications: the first is sent from TACFv1-2 to request theestablishment of the radio access link between the MS and BTS1 for newcall 2, the second is sent from TACFv2-1 to request the radio accesslink between the MS and BTS2 for existent call 1, and the third is fromTACFv2-2 for the radio access link between the MS and BTS2 for new call2. Upon the reception of the third RADIO BEARER SETUP REQUEST requestindication from TACFv2-2, TACFa sends a single message includingcontents of a HANDOVER BRANCH ADDITION request indication and of a RADIOBEARER SETUP request indication to TACAFa in the MS. The RADIO BEARERSETUP request indication is used for requesting to establish the mainbranch for call 2, which will be the subject of synchronization later,via BTS1. The HANDOVER BRANCH ADDITION request indication is used forestablishing the auxiliary branches via BTS2 for diversity handover ofboth calls 1 and 2.

(14) Subsequently, the MS starts to synchronize process of the MS withprocess of the BTS1 with respect to the radio access link of the mainbranch for new call 2.

(15) After completion of the synchronization, BCFr1-2 in BTS1 sends aBEARER-AND-RADIO-BEARER SETUP response confirmation to TACFv1-2 in thebase station controller to report the completion of the synchronizationon the radio access link.

(16) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP responseconfirmation, TACFv1-2 in BTS1 sends a BEARER SETUP responseconfirmation to TACFa in order to report the completion of the accesslink setup. Consequently, the MS can use the same diversity handoverbranches via BTS1 and BTS2 and can use the same frequency f1 for bothcalls 1 and 2.

FIG. 779 is a sequential flow diagram representing the operationexemplified in FIG. 777 of the system. In FIG. 779, meanings of TACAFa,TACFv1-1, and so on are the same as those in FIG. 778. Another methodwill be described with reference to FIGS. 777 and 779.

If new call 2 occurs to or from the MS while the MS treats existent call1 using BTS1 as represented in part (a) of FIG. 777, TACFa in the basestation controller ascertains radio resources occupied by existent call1 and all available radio resources in all of the base stations (BTS1and BTS2 in FIG. 777) where the MS visits.

Then, TACFa determines how to treat all calls, including the new call,for the MS on the basis of the ascertainment. In other words, TACFa inthe base station controller determines to allocate the radio branchbetween the MS and BTS2 to calls 1 and 2 as described above withreference to part (b) of FIG. 777. According to the determination, thefollowing steps are advanced in the system.

(1) In order to request to establish an access link for existent call 1via BTS2 where the MS visits, TACFa sends a BEARER SETUP requestindication to TACFv2-1 in the base station controller, which controlsBTS2.

(2) Upon the reception of the BEARER SETUP request indication, TACFv2-1sends a BEARER-AND-RADIO-BEARER SETUP request indication to BCFr2-1 inBTS2 to request to establish a radio access link between BTS2 and the MSand a wired access link between BTS2 and the base station controller forcall 1.

(3) Additionally, TACFa in the base station controller sends anotherBEARER SETUP request indication to TACFv2-2 in the base stationcontroller, which controls BTS2 in order to request to establish anaccess link for new call 2 via BTS2 where the MS visits.

(4) Upon the reception of the BEARER SETUP request indication, TACFv2-2sends another BEARER-AND-RADIO-BEARER SETUP request indication toBCFr2-2 in BTS2 to request to establish another radio access linkbetween BTS2 and the MS and another wired access link between BTS2 andthe base station controller for call 2.

(5) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP requestindication from TACFv2-1, BCFr2-1 in BTS2 starts establishing therequested radio and wired access links, and then, sends a RADIO BEARERSETUP PROCEEDING request indication to TACFv2-1 in the base stationcontroller to report that the access link setup is proceeding.

(6) Upon the reception of the RADIO BEARER SETUP PROCEEDING requestindication, TACFv2-1 sends a RADIO BEARER SETUP REQUEST requestindication to TACFa to request to establish the radio access link forexistent call 1 between the MS and BTS2.

(7) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP requestindication from TACFv2-2, BCFr2-2 in BTS2 starts establishing therequested radio and wired access links, and then, sends a RADIO BEARERSETUP PROCEEDING request indication to TACFv2-2 in the base stationcontroller to report that the access link setup is proceeding.

(8) Upon the reception of the RADIO BEARER SETUP PROCEEDING requestindication, TACFv2-2 sends another RADIO BEARER SETUP REQUEST requestindication to TACFa to request to establish the radio access link fornew call 2 between the MS and BTS2.

(9) TACFa sends a single message including contents of a NON-SOFTHANDOVER EXECUTION request indication and of a RADIO BEARER SETUPrequest indication to TACAFa in the MS. The NON-SOFT HANDOVER BRANCHEXECUTION request indication is used for requesting to replace theexistent radio access link via BTS1 with the new branch via BTS2 forexistent call 1. The HANDOVER BRANCH ADDITION request indication is usedfor establishing the radio access link via BTS1 for call 2.

(10) Subsequently, the MS starts to synchronize process of the MS withprocess of the BTS2 with respect to the new radio access link forexistent call 1.

(11) Furthermore, the MS starts to synchronize process of the BTS2 withprocess of the MS with respect to the new radio access link for new call2.

(12) After completion of the synchronization for call 1, BCFr2-1 in BTS2sends a BEARER-AND-RADIO-BEARER SETUP response confirmation to TACFv2-1in the base station controller to report the completion of thesynchronization on the radio access link.

(13) After completion of the synchronization for call 2, BCFr2-2 in BTS2sends another BEARER-AND-RADIO-BEARER SETUP response confirmation toTACFv2-2 in the base station controller to report the completion of thesynchronization on the radio access link.

(14) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP responseconfirmation from BCFr2-1, TACFv2-1 sends a BEARER SETUP responseconfirmation to TACFa in the base station controller in order to reportthat the establishment of the radio access link via BTS2 for existentcall 1 is completed.

(15) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP responseconfirmation from BCFr2-2, TACFv2-2 sends another BEARER SETUP responseconfirmation to TACFa in the base station controller in order to reportthat the establishment of the other radio access link via BTS2 for newcall 2 is completed.

(16) TACFa thus receives two BEARER SETUP response confirmations fromTACFv2-1 and TACFv2-2. Then, it sends a BEARER RELEASE requestindication to TACFv1-1 for requesting the former or existent access linkfor call 1.

(17) Upon the reception of the BEARER RELEASE request indication,TACFv1-1 sends a BEARER-AND-RADIO-BEARER RELEASE request indication toBCFr1-1 for requesting to release the former access link via BTS1 forcall 1.

(18) Upon the reception of the BEARER-AND-RADIO-BEARER RELEASE requestindication, BCFr1-1 releases the former access link via BTS1 for call 1,and then, sends a BEARER-AND-RADIO-BEARER RELEASE response confirmationto report the completion of the access link release.

(19) Next, TACFv1-1 in BTS1 sends a BEARER RELEASE response confirmationto TACFa in the base station controller to report the completion of theaccess link release. Accordingly, the MS treats calls 1 and 2 using thenew branch via BTS2 and frequency f2.

3.7 First Method for Controlling Branch Structure and Frequency BandWhen a Handover Initiation Occurs While Mobile Station Treats aPlurality of Calls

3.7.1 Background of Invention of the Method

The method described below is intended to resolve a problem involved ina mobile station which can treats a plurality of calls simultaneously.It is possible that a handover initiation occurs for this kind of mobilestation while it treats a plurality of calls. In this case, it ispossible that different branch structures and different frequency bandsare allocated to the calls, respectively, if handover control for eachcall is independently carried out. Thus, it is necessary for the networkto control respective calls with regard to handover of mobile stationand transmission power, so that the network should endure an enormousburden with respect to preparation of overheads of messages. The controlmethod described below will resolve the above-mentioned problems.

3.7.2 Embodying Method

In accordance with an method according to an embodiment of the presentinvention, when a trigger of handover occurs to the mobile station whichis treating a plurality of calls for the reason of the travelling of themobile station or other situations, a branch structure or acommunication frequency band which can continue all of the calls isselected, and the selected branch structure or communication frequencyband are assigned to all of the calls commonly.

FIG. 780 is a diagram representing an embodying method. As representedin part (a) of FIG. 780, an MS treats calls 1 and 2 at frequency f1using diversity handover branch structure including a branch between theMS and BTS1 and a branch between the MS and BTS2. Assume that the MSmoves toward BTS3, so as to be capable of communicating with BTS3 atfrequency f1. In addition, assume that the capacity of BTS3 issufficient, so that it is possible to establish radio accesses betweenthe MS and BTS3 for both calls 1 and 2.

Accordingly, in the embodying method, handover is carried out such thatthe branch between the MS and BTS3 is added to the current branchstructure and such that calls 1 and 2 are treated by the branchstructure including the branch between the MS and BTS1; the branchbetween the MS and BTS2; and the branch between the MS and BTS3 asrepresented in part (b) of FIG. 780.

FIG. 781 is a diagram representing another embodying method. Asrepresented in part (a) of FIG. 781, an MS treats calls 1 and 2 atfrequency f1 using a branch between the MS and BTS1. Assume that the MSis departing from the radio zone of BTS1 and comes near BTS3, so that itis necessary to add a branch between the MS and BTS3 for the MS. Inaddition, assume that the capacity of BTS3 is sufficient, so that it ispossible to establish radio accesses between the MS and BTS3 for bothcalls 1 and 2.

However, BTS3 uses a frequency band f2, which is different from that ofBTS1, so that the MS cannot conduct diversity reception by BTS1 andBTS2. Therefore, in the embodying method, the branch structure isreplaced with BTS3 for both calls 1 and 2 as represented in part (b) ofFIG. 781.

FIG. 782 is a sequential flow diagram representing the operationexemplified in FIG. 780 of the system. In FIG. 782, TACAFa designates afunctional entity in the MS shown in FIG. 780. TACFa designates afunctional entity in the base station controller generated first afterthe MS has started communication. TACFv3-1 and TACFv3-2 designateinstances of functional entities in the base station controller in orderthat the base station controller controls BTS3 where the MS visits.TACFv3-1 and TACFv3-2 correspond to calls 1 and 2, respectively. BCFr3-1and BCFr3-2 designate instances of functional entities in BTS3 forcontrolling radio resources. BCFr3-1 and BCFr3-2 correspond to calls 1and 2, respectively. The subject method for transiting from the state ofpart (a) to the state of part (b) in FIG. 780 will be described withreference to FIG. 782.

(1) TACFa in the base station controller sends a BEARER SETUP requestindication to TACFv3-1 in the base station controller corresponding toBTS3 in order to establish an access link between BTS3 and the MS forcall 1.

(2) Upon the reception of the BEARER SETUP request indication, TACFv3-1sends a BEARER-AND-RADIO-BEARER SETUP request indication to BCFr3-1 inBTS3 to request to establish a radio access link between BTS3 and the MSand a wired access link between BTS3 and the base station controller forcall 1.

(3) In addition, TACFa in the base station controller sends anotherBEARER SETUP request indication to TACFv3-2 in the base stationcontroller corresponding to BTS3 in order to establish another accesslink between BTS3 and the MS for call 2.

(4) Upon the reception of the BEARER SETUP request indication, TACFv3-2sends a BEARER-AND-RADIO-BEARER SETUP request indication to BCFr3-2 inBTS3 to request to establish another radio access link between BTS3 andthe MS and another wired access link between BTS3 and the base stationcontroller for call 2.

(5) In accordance with the BEARER-AND-RADIO-BEARER SETUP requestindication from TACFv3-1, BCFr3-1 in BTS3 establishes the requestedradio and wired access links for call 1, and then, sends aBEARER-AND-RADIO-BEARER SETUP response confirmation to TACFv3-1 in thebase station controller to report that the access link setup iscompleted.

(6) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP responseconfirmation, TACFv3-1 sends a RADIO BEARER SETUP REQUEST requestindication to TACFa to request to establish the radio access link forcall 1 between the MS and BTS3.

(7) In accordance with the BEARER-AND-RADIO-BEARER SETUP requestindication from TACFv3-2, BCFr3-2 in BTS3 establishes the requestedradio and wired access links for call 2, and then, sends anotherBEARER-AND-RADIO-BEARER SETUP response confirmation to TACFv3-2 in thebase station controller to report that the access link setup iscompleted.

(8) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP responseconfirmation, TACFv3-2 sends another RADIO BEARER SETUP REQUEST requestindication to TACFa to request to establish the radio access link forcall 2 between the MS and BTS3.

(9) Then, TACFa sends a HANDOVER BRANCH ADDITION request indication toTACAFa in the MS to additionally establish a new radio access linkbetween BTS3 and the MS for calls 1 and 2 without releasing the formerlyused radio access links via BTS1 and BTS2 for calls 1 and 2.

(10) In accordance with the HANDOVER BRANCH ADDITION request indication,TACAFa completes to establish the additional radio access link betweenBTS3 and the MS for calls 1 and 2. TACAFa in the MS then sends aHANDOVER BRANCH ADDITION response confirmation to TACFa in the basestation controller for notifying of the completion. Consequently, the MSuses the diversity handover branch structure including the branches viaBTS1, BTS2, and BTS3 for treating both calls 1 and 2.

FIG. 783 is a sequential flow diagram representing the operationexemplified in FIG. 781 of the system. In FIG. 783, TACAFa designates afunctional entity in the MS shown in FIG. 781. TACFa designates afunctional entity in the base station controller generated first afterthe MS has started communication. TACFv1-1 and TACFv1-2 designateinstances of functional entities in the base station controller in orderthat the base station controller controls BTS1. TACFv1-1 and TACFv1-2correspond to calls 1 and 2, respectively. TACFv3-1 and TACFv3-2designate instances of functional entities in the base stationcontroller in order that the base station controller controls BTS3.TACFv3-1 and TACFv3-2 correspond to calls 1 and 2, respectively. BCFr1-1and BCFr1-2 designate instances of functional entities in BTS1 forcontrolling radio resources. BCFr1-1 and BCFr1-2 correspond to calls 1and 2. BCFr3-1 and BCFr3-2 designate instances of functional entities inBTS3 for controlling radio resources. BCFr3-1 and BCFr3-2 correspond tocalls 1 and 2, respectively. The subject method for transiting from thestate of part (a) to the state of part (b) in FIG. 781 will be describedwith reference to FIG. 783.

(1) TACFa in the base station controller sends a BEARER SETUP requestindication to TACFv3-1 in the base station controller corresponding toBTS3 in order to establish an access link between BTS3 and the MS forcall 1.

(2) Upon the reception of the BEARER SETUP request indication, TACFv3-1sends a BEARER-AND-RADIO-BEARER SETUP request indication to BCFr3-1 inBTS3 to request to establish a radio access link between BTS3 and the MSand a wired access link between BTS3 and the base station controller forcall 1.

(3) In addition, TACFa in the base station controller sends anotherBEARER SETUP request indication to TACFv3-2 in the base stationcontroller corresponding to BTS3 in order to establish another accesslink between BTS3 and the MS for call 2.

(4) Upon the reception of the BEARER SETUP request indication, TACFv3-2sends a BEARER-AND-RADIO-BEARER SETUP request indication to BCFr3-2 inBTS3 to request to establish another radio access link between BTS3 andthe MS and another wired access link between BTS3 and the base stationcontroller for call 2.

(5) In accordance with the BEARER-AND-RADIO-BEARER SETUP requestindication from TACFv3-1, BCFr3-1 in BTS3 starts to establish therequested radio and wired access links for call 1, and then, sends aBEARER-AND-RADIO-BEARER SETUP PROCEEDING request indication to TACFv3-1in the base station controller to report that the access link setup isproceeding.

(6) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP PROCEEDINGrequest indication, TACFv3-1 sends a RADIO BEARER SETUP REQUEST requestindication to TACFa in the base station controller to request toestablish the radio access link for call 1 between the MS and BTS3.

(7) In accordance with the BEARER-AND-RADIO-BEARER SETUP requestindication from TACFv3-2, BCFr3-2 in BTS3 starts to establish therequested radio and wired access links for call 2, and then, sendsanother BEARER-AND-RADIO-BEARER SETUP PROCEEDING request indication toTACFv3-2 in the base station controller to report that the access linksetup is proceeding.

(8) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP PROCEEDINGrequest indication from BCFr3-2 , TACFv3-2 sends another RADIO BEARERSETUP REQUEST request indication to TACFa to request to establish theradio access link for call 2 between the MS and BTS3.

(9) Upon the reception of the second RADIO BEARER SETUP REQUEST requestindication, TACFa sends a NON-SOFT HANDOVER EXECUTION request indicationto TACAFa in the MS to request to replace the radio access link via BTS1with the radio access link via BTS3 for both calls 1 and 2.

(10) In accordance with the NON-SOFT HANDOVER EXECUTION requestindication, TACAFa in the MS replaces the radio access link, and startsto synchronize process of the mobile station with process of BTS3 forcall 1 with respect to the new radio access link.

(11) Furthermore, the MS starts to synchronize process of the mobilestation with process of BTS3 for call 2 with respect to the new radioaccess link.

(12) After completion of the synchronization for call 1, BCFr3-1 in BTS3sends a BEARER-AND-RADIO-BEARER SETUP response confirmation to TACFv3-1in the base station controller to report the completion of thesynchronization on the radio access link.

(13) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP responseconfirmation from BCFr3-1, TACFv3-1 sends a BEARER SETUP responseconfirmation to TACFa in order to report the completion of the accesslink setup.

(14) On the other hand, after completion of the synchronization for call2, BCFr3-2 in BTS3 sends another BEARER-AND-RADIO-BEARER SETUP responseconfirmation to TACFv3-2 in the base station controller to report thecompletion of the synchronization on the radio access link.

(15) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP responseconfirmation from BCFr3-2, TACFv3-2 sends another BEARER SETUP responseconfirmation to TACFa in order to report the completion of the accesslink setup.

(16) TACFa thus receives two BEARER SETUP response confirmations fromTACFv3-1 and TACFv3-2. Then, it sends a BEARER RELEASE requestindication to TACFv1-1 for requesting the former or existent access linkfor call 1.

(17) Upon the reception of the BEARER RELEASE request indication,TACFv1-1 sends a BEARER-AND-RADIO-BEARER RELEASE request indication toBCFr1-1 for requesting to release the former access link via BTS1 forcall 1.

(18) Upon the reception of the BEARER-AND-RADIO-BEARER RELEASE requestindication, BCFr1-1 releases the former access link via BTS1 for call 1,and then, sends a BEARER-AND-RADIO-BEARER RELEASE response confirmationto TACFv1-1 to report the completion of the access link release.

(19) Next, TACFv1-1 in BTS1 sends a BEARER RELEASE response confirmationto TACFa in the base station controller to report the completion of theaccess link release.

Furthermore, as represented in FIG. 783, the processes similar to steps(16) through (19) are executed for call 2 from step (20) to (23).Consequently, the MS uses the single branch between the MS and BTS3 fortreating both calls 1 and 2.

3.8 Second Method for Controlling Branch Structure and Frequency BandWhen a Handover Initiation Occurs While Mobile Station Treats aPlurality of Calls

3.8.1 Background of Invention of the Method

In accordance with the method described at section 3.7, when a triggerof handover occurs to the mobile station which is treating a pluralityof calls, a branch structure or a communication frequency band which cancontinue all of the calls is selected, and the selected branch structureor communication frequency band are assigned to all of the callscommonly.

However, it may be impossible to allocate radio resources of the newlyvisited base station to all calls for the mobile station because ofinsufficiency of capacity of the base station. In this case, if nocountermeasure is taken, all calls should be released.

However, priorities of calls are not necessarily the same as each other:it is possible that a call is an emergency call. Although all callscannot be maintained, one or more calls being high in priority can besometimes maintained such that radio resources can be allocated to them.In this case, release of all calls is not reasonable.

The control method described below will resolve the above-mentionedproblems.

3.8.2 Embodying Method

In accordance with a method of an embodiment of the present invention,when a trigger of handover occurs to the mobile station which istreating a plurality of calls for the reason of the travelling of themobile station or other situations, the handover is carried out asfollows:

a. A mobile station or a device (e.g., base station controller) in thenetwork determines whether or not there is a branch structure or afrequency band for continuing all calls.

b. When there is not a branch structure which can continue all of thecalls or there is not a frequency band which can continue all of thecalls, the mobile station or the device recognizes the idle capacity ofthe newly visited base station available for the mobile station.

c. One or more calls among the treated calls are selected in accordancewith priority so that the calls being high in priority can be maintainedby the idle capacity. The other calls are released. When a plurality ofcalls have the same priority, all calls are released or one or more areselected in accordance with another fashion (e.g., by random selectionor in accordance with the length of the connecting time) and the othersare released.

d. The selected call or calls are handed over to the new branch or thefrequency in relation to the idle capacity.

According to the control method, the call(s) of low priority is releasedto continue the call(s) of high priority, and the handover is carriedout for the priority call(s) such that priority calls utilize a commonbranch structure and a common frequency band if a plurality of prioritycalls are selected to be continued.

FIG. 784 is a diagram representing an embodying method. In part (a) ofFIG. 784, an MS uses a branch at frequency f1 between BTS1 and the MS,thereby treating calls 1 and 2. The MS is travelling from the radio zonecorresponding to BTS1 to the radio zone corresponding to BTS3 and the MSshould be handed over from BTS1 to BTS3 at this time.

However, the capacity of the BTS3 is too insufficient to continue bothcalls 1 and 2. More specifically, it will be possible to continue onlycall 1 of high priority. In addition, the frequency f2 is used by BTS3,so that it is impossible to carry out diversity handover from BTS1 toBTS3.

Accordingly, call 2 being low in priority for the MS is released andcall 1 of high priority is controlled to remain and is handed over fromthe branch via BTS1 to the branch via BTS3 as represented in part (b) ofFIG. 784 in the embodiment.

FIG. 785 is a sequential flow diagram representing the operationexemplified in FIG. 784 of the system. In FIG. 785, meanings of TACAFa,TACFv1-1, and so on are the same as those in FIG. 783. The subjectmethod for transiting from the state illustrated in part (b) to thestate illustrated in part (a) of FIG. 784 will be described withreference to FIG. 785.

(1) TACFa in the base station controller sends a BEARER SETUP requestindication to TACFv3-1 in the base station controller corresponding toBTS3 in order to establish an access link between BTS3 and the MS forcall 1.

(2) Upon the reception of the BEARER SETUP request indication, TACFv3-1sends a BEARER-AND-RADIO-BEARER SETUP request indication to BCFr3-1 inBTS3 to request to establish a radio access link between BTS3 and the MSand a wired access link between BTS3 and the base station controller forcall 1.

(3) In addition, TACFa in the base station controller sends a BEARERRELEASE request indication to TACFv1-2 in the base station controllercorresponding to BTS1 for requesting the access link for lower prioritycall 2.

(4) Upon the reception of the BEARER RELEASE request indication,TACFv1-2 sends a BEARER-AND-RADIO-BEARER RELEASE request indication toBCFr1-2 in BTS1 for requesting to release the radio access link betweenBTS1 and the MS and the wired access link between BTS1 and the basestation controller for call 2.

(5) On the other hand, in accordance with the BEARER-AND-RADIO-BEARERSETUP request indication from TACFv3-1, BCFr3-1 in BTS3 starts toestablish the requested radio and wired access links for call 1, andthen, sends a BEARER-AND-RADIO-BEARER SETUP PROCEEDING requestindication to TACFv3-1 in the base station controller to report that theaccess link setup is proceeding.

(6) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP PROCEEDINGrequest indication, TACFv3-1 sends a RADIO BEARER SETUP REQUEST requestindication to TACFa in the base station controller to request toestablish the radio access link for call 1 between the MS and BTS3.

(7) Upon the reception of the BEARER-AND-RADIO-BEARER RELEASE requestindication, BCFr1-2 releases the access link for call 2 via BTS1 forcall 1, and then, sends a BEARER-AND-RADIO-BEARER RELEASE responseconfirmation to TACFv1-2 to report the completion of the access linkrelease for call 2.

(8) Upon the reception of the BEARER-AND-RADIO-BEARER RELEASE responseconfirmation, TACFv1-2 in BTS1 sends a BEARER RELEASE responseconfirmation to TACFa in the base station controller to report thecompletion of the access link release for call 2.

(9) Upon the reception of the BEARER-AND-RADIO-BEARER RELEASE responseconfirmation, TACFa sends a NON-SOFT HANDOVER EXECUTION requestindication to TACAFa in the MS to request to replace the radio accesslink via BTS1 with the radio access link via BTS3 for the MS.

(10) In accordance with the NON-SOFT HANDOVER EXECUTION requestindication, TACAFa in the MS replaces the radio access link, and startsto synchronize process of the mobile station with process of BTS3 forcall 1 with respect to the new radio access link.

(11) After completion of the synchronization for call 1, BCFr3-1 in BTS3sends a BEARER-AND-RADIO-BEARER SETUP response confirmation to TACFv3-1in the base station controller to report the completion of thesynchronization on the radio access link.

(12) Upon the reception of the BEARER-AND-RADIO-BEARER SETUP responseconfirmation from BCFr3-1, TACFv3-1 sends a BEARER SETUP responseconfirmation to TACFa in order to report the completion of the accesslink setup.

(13) Upon the reception of the BEARER SETUP response confirmation fromTACFv3-1, TACFa sends another BEARER RELEASE request indication toTACFv1-1 for requesting the former and unnecessary access link for call1.

(14) Upon the reception of the BEARER RELEASE request indication,TACFv1-1 sends a BEARER-AND-RADIO-BEARER RELEASE request indication toBCFr1-1 for requesting to release the former access link via BTS1 forcall 1.

(15) Upon the reception of the BEARER-AND-RADIO-BEARER RELEASE requestindication, BCFr1-1 releases the former access link for call 1 via BTS1for call 1, and then, sends a BEARER-AND-RADIO-BEARER RELEASE responseconfirmation to report the completion of the access link release.

(16) Next, TACFv1-1 in BTS1 sends a BEARER RELEASE response confirmationto TACFa in the base station controller to report the completion of theaccess link release for call 1. Consequently, only call 1 of highpriority is continued by the use of the branch via BTS3.

3.9 Method for Handover Wherein the Branch Addition Procedure isCompleted Without Confirmation of Synchronization of Branches

3.9.1 Background of Invention of the Method

In conventional mobile communications system, a handover branch additionprocedure is carried out as follows:

(1) A new branch is additionally established between the mobile stationand a new base station.

(2) The new base station confirms that the receiving process in the basestation is synchronized with the radio signals from the mobile station.

(3) The new base station reports to the base station controller aboutthe completion of the synchronization.

(4) The branch addition procedure is completed.

However, as described above, a necessary communication quality issometimes obtained by a plurality of branches including one or moreauxiliary branches added on demand in the present system althoughminimal transmission power is consumed. In this structure, it is notlimited that each branch satisfies the necessary level of the quality.Therefore, sometimes it is impossible to execute synchronization withrespect to an auxiliary branch for which the transmission power is low.

Accordingly, if the conventional handover branch addition procedureincluding above-described steps (1) through (4) is applied to thepresent system, there is likelihood that it is impossible to confirm thesynchronization with respect to a new branch and the branch additionprocedure is continued for an unnecessarily long time. The methoddescribed below resolves the problems.

3.9.2 Embodying Method

In accordance with the present system, the handover branch additionprocedure is completed upon the onset of communicating a layer 3 messagewithout waiting for the confirmation of synchronization for a newlyadded branch.

Consequently, the base station controller finishes the handover branchaddition procedure without waiting for the confirmation ofsynchronization for the newly added branch although it sends SETUPrequest indications for the new branch to the base station and mobilestation.

Upon the reception of the setup request for the new branch, the mobilestation adapts the interior functions and the communication frequency tothe new branch, so as to enter the state for receiving signals from thenew branch. Then, once the mobile station receives a meaningful signalfrom the branch, the mobile station starts the diversity combining usingwith signals received from the new branch and another branch since thenew branch can be considered to be established.

Similarly, upon the reception of the setup request for the new branch,the base station adapts the interior functions and the communicationfrequency to the new branch, so as to enter the state for receivingsignals from the new branch. Then, once the base station receives ameaningful signal from the branch, the base station starts to transmitsignals via the new branch since it can be considered to be established.At the same time, the base station starts the diversity combining usingwith signals received from the new branch and another branch if the basestation conducts intra-cell diversity handover. Alternatively, the basestation starts to transfer signals received from the new branch to thebase station controller so that the base station controller can startthe diversity combining using with signals from the base station andanother base station if the base station controller conducts inter-celldiversity handover.

The above-described method is applied into various control methods whichhave been already described before this section. For example, FIG. 41 isan information flow diagram of the inter-sector handover branch additionin a single cell while FIG. 43 is an information flow diagram of theinter-cell handover branch addition. In the branch addition proceduresin the diagrams, once layer 1 connection is established, the mobilestation can communicate. Accordingly, the network finishes the branchaddition procedure without waiting for the confirmation ofsynchronization for the newly added auxiliary branch.

FIG. 770 is a sequential flow diagram representing the start ofinter-cell diversity handover simultaneously with the access link setup.In this procedure, the mobile station can start communicating layer 3messages once the synchronization on layer 1 about the main branchbetween TACAFa and BCFr1 is completed. Therefore, the handover procedureis ended without waiting for the confirmation of synchronization for theauxiliary branch between TACAFa and BCFr2.

FIG. 773 is a sequential flow diagram representing an operation in theinvented system which is carried out when the mobile station moves to adiversity handover zone. In this procedure, the mobile station can startcommunicating layer 3 messages once the synchronization on layer 1 aboutthe new main branch between TACAFa and BCFr2 is completed after thebranch replacement. Therefore, the handover procedure is ended withoutwaiting for the confirmation of synchronization for the auxiliary branchbetween TACAFa and BCFr3.

The same is applied to other diversity handover procedures illustratedin FIGS. 775, 778, and so on.

3.10 Method for Controlling Management of Code Resources

3.10.1 Background of Invention of the Method

In a usual method for controlling management of code resources, coderesources are reassigned (calls are rearranged) when a call isoriginated or ended. However, if code resources are reassigned upon acall occurrence, a long delay of the link establishment occurs. If coderesources are reassigned at the end of a call, the control for thereassignment is redundant and causes the increase of a control burden.

There is a mobile communications system wherein an assignable coderesource can be divided into a plurality of code resources, and any ofthe original code resource and the divided code resources can beselected in accordance with the length corresponding to a necessarybandwidth and be assigned to a call. In this system, when the dividedcode resources are repeated to be assigned and released blithely, thefragmented assignable code resources are dispersed in the code resourcespace. In order to broaden the bandwidth, an unused code resource havingthe length corresponding to the necessary bandwidth should be reserved.

Therefore, reassignment of code resources to calls is necessary forrearranging the fragments to reserve unused code resources correspondingto wide bandwidth.

However, if code resources are reassigned upon a call occurrence, a longdelay of the link establishment occurs. If code resources are reassignedat the end of a call, the control for the reassignment is redundant andcauses the increase of a control burden since the next call is notnecessarily a wide band call.

The selection of trigger timing for reassigning code resources (forrearranging calls) is an important consideration for improvingoperability and reducing the system burden.

It is an object of the mobile communications system, base station, basestation controller, and method for controlling thereof to optimize thetrigger timing for reassigning code resources, to reduce the number ofreassignments, and to minimize the delay of the link setup.

3.10.2 Embodying Method

FIG. 793 represents a state where code resources have been assigned tochannels. In the state illustrated in FIG. 793, only code resourcesCR5-2, CR5-7, CR5-8, CR5-9, CR5-11, CR5-15, and CR5-16 are not used norassigned, but available with respect to level 5 since nodes upper thanthe available code resources are not used.

In addition, with respect to upper levels, a code resource at a node isavailable if all of the lower leaves and the upper node are not used.More specifically, with respect to a node N1, the lower leaves CR5-15and CR5-16 and the upper node N2 are not used, so that the code resourceCR4-8 at the node N1 is available.

The reason for the above-mentioned characteristics is because any uppercode resource is divided into lower code resources. Therefore, thebandwidth relationship can be expressed by the following equation.WCR1=2×(WCR2)=4×(WCR3)=8×(WCR4)=16×(WCR5)where WCR1 is the bandwidth corresponding to the code resource CR1 atlevel 1, WCR2 is the bandwidth corresponding to code a resource CR2 atlevel 2, WCR3 is the bandwidth corresponding to code a resource CR3 atlevel 3, WCR4 is the bandwidth corresponding to code a resource CR4 atlevel 4, and WCR5 is the bandwidth corresponding to code a resource CR5at level 5. Therefore, for example, the bandwidth WCR4 corresponding toa code resource CR4 at level 4 can be utilized by two code resources CR5at level 5.

In the state shown in FIG. 793, it is impossible to reserve a coderesource CR3 at level 3 which may be divided into four code resourcesCR5 at level 5 although there are seven unused code resources CR5-2,CR5-7, CR5-8, CR5-9, CR5-11, CR5-15, and CR5-16 at level 5. The reasonsare because all code resources CR3-1 through CR3-4 are independent ofone another and any successive code resource cannot be assembled fromparts of respective code resources CR3-1 through CR3-4, and at least apart of each of code resources CR3-1 through CR3-4 have been alreadyused at the lower levels.

In order to use a code resource CR3 at level 3, it is necessary to useother code resources instead of the used code resources at levels 4 or 5below the subject code resource CR3 as represented in FIG. 794.

For this purpose, the radio base station determines whether a coderesource corresponding to a necessary bandwidth can be availed or not.The base station controller reassigns the code resources on the bases ofthe determination.

More specifically, when the radio base station determines that coderesource CR3-4 cannot be reserved, the base station controller assignsthe unused code resource CR5-9 instead of the used code resource CR5-11being of the same length at step S1. In addition, the base stationcontroller assigns the unused code resource CR4-7 instead of the usedcode resource CR4-6 being of the same length at step S2. Thus, the coderesource CR3-4 can be reserved.

As described above, the selection of trigger timing for reassigning coderesources (for rearranging calls) is an important consideration forreducing the system burden. In the embodying method, once all availablecode resources corresponding to a preselected bandwidth are assigned,the reassignment is started.

More specifically, assume that the code resource CR3 at level 3 isselected as a standard code resource that is the longest assignable coderesource corresponding to the usable widest bandwidth. Simultaneously,the bandwidth corresponding to the code resource CR3 at level 3 isselected as a standard bandwidth. Once all standard code resources CR3cannot be assigned as represented in FIG. 793, the reassignment of coderesources is triggered as represented in FIG. 794. Since thereassignment procedure is not carried out at the call occurrence, thedelay of the link setup can be minimized. In addition, it is possible toreduce the control burden for the system in comparison with the casethat the reassignment is always conducted at call release.

As described above, it is possible to reduce the number of reassignmentsand to minimize the delay of the link setup, whereby service quality andoperability given to the user can be improved.

1-53. (canceled)
 54. A method for controlling a branch replacementcharacterized in that at least a current branch between a network and amobile station are replaced with a plurality of branches necessary forcommunication using diversity handover when the branch replacement isnecessary for the mobile station and when it is recognized that themobile station can commence communicating using diversity handover ifthe branch replacement is carried out, thereby enabling the mobilestation to commence diversity handover.
 55. A method according to claim54, wherein the network additionally establishes an auxiliary branch forthe mobile station, and then releases the current branch, so as tocomplete the branch replacement for communicating using diversityhandover.
 56. A mobile station characterized in that it replaces atleast a current branch between a network and the mobile station with aplurality of branches necessary for communication using diversityhandover when a branch replacement is necessary for the mobile stationand when the mobile station can commence communicating using thediversity handover branches if the branch replacement is carried out,thereby commencing diversity handover.
 57. A base station controllercharacterized in that it replaces at least a current branch between anetwork and a mobile station with a plurality of branches necessary forcommunication using diversity handover when a branch replacement isnecessary for the mobile station and when it is recognized that themobile station can commence communicating using diversity handover ifthe branch replacement is carried out, thereby enabling the mobilestation to commence diversity handover.
 58. A base station controllercharacterized in that it transmits a message to abase station and amobile station when a branch replacement is necessary for the mobilestation and when it is recognized that, if the branch replacement iscarried out, the mobile station can commence communicating by means ofintra-cell diversity handover wherein the mobile station and the basestation communicate with each other using a plurality of branches, themessage including an instruction to carry out the branch replacement andan instruction to add at least one auxiliary branch for additional usein order to communicate using diversity handover.
 59. A base stationcontroller characterized in that it transmits an instruction to aplurality of base stations and a message to a mobile station when abranch replacement is necessary for the mobile station and when it isrecognized that the mobile station can commence communicating by meansof inter-cell diversity handover if the branch replacement is carriedout, the instruction instructing the base stations to set branchesnecessary for the diversity handover, the message including aninstruction to carry out the branch replacement and an instruction toadd at least one auxiliary branch for additional use in order tocommunicate using diversity handover.
 60. A base station characterizedin that it replaces a branch for a mobile station and adds at least oneauxiliary branch for the mobile station according to instructions of amessage once the base station receives the message from a base stationcontroller, the message including an instruction to carry out branchreplacement and an instruction to add at least one auxiliary branch foradditional use in order to communicate using diversity handover, therebycommencing the intra-cell diversity handover.
 61. A branch controllingmethod for a mobile station capable of treating a plurality of callssimultaneously, characterized in that when a new call occurs while themobile station treats an existent call, at least either of branchstructures for both of the calls or at least either of communicationfrequency bands for both of the calls is controlled, so that the branchstructures are the same as each other and the communication frequencybands are the same as each other.
 62. A branch controlling method for amobile station capable of treating a plurality of calls simultaneously,characterized in that when a new call occurs while the mobile stationtreats an existent call, the a branch structure and a communicationfrequency band, being the same as those for the existent call, areassigned to the new call.
 63. A mobile station capable of treating aplurality of calls simultaneously, characterized in that when a new calloccurs while the mobile station treats an existent call, the mobilestation uses a branch structure and a communication frequency band,being the same as those for the existent call, for the new call inaccordance with an instruction from a network.
 64. A base stationcontroller adapted for a mobile station capable of treating a pluralityof calls simultaneously, characterized in that when a new call occurswhile the mobile station treats an existent call, the base stationcontroller controls at least either of branch structures for both of thecalls or at least either of communication frequency bands for both ofthe calls, so that the branch structures are the same as each other andthe communication frequency bands are the same as each other.
 65. A basestation controller adapted for a mobile station capable of treating aplurality of calls simultaneously, characterized in that when a new calloccurs while the mobile station treats an existent call, the basestation controller assigns a branch structure and a communicationfrequency band, being the same as that for the existent call, to the newcall.
 66. A branch controlling method adapted for a mobile stationcapable of treating a plurality of calls simultaneously, characterizedin that when a new call occurs while the mobile station treats anexistent call and when it is impossible to assign a branch structure ora communication frequency band, being the same as the branch structureor the communication frequency band for the existent call, to the newcall, another branch structure or another communication frequency bandwhich can continue both of the existent and new calls is selected, andthe selected branch structure or communication frequency band isassigned to both of the existent and new calls.
 67. A method accordingto claim 61, wherein the existent call is assigned to diversity handoverbranches and the new call is also assigned to the same diversityhandover branches if possible.
 68. A mobile station capable of treatinga plurality of calls simultaneously, characterized in that when a newcall occurs while the mobile station treats an existent call and when itis impossible to assign a branch structure or a communication frequencyband, being the same as the branch structure or the communicationfrequency band for the existent call, to the new call, the mobilestation assigns another branch structure or another communicationfrequency band, which can continue both of the existent and new calls,to both of the existent and new calls in accordance with an instructionfrom a network.
 69. A base station controller adapted for a mobilestation capable of treating a plurality of calls simultaneously,characterized in that when a new call occurs while the mobile stationtreats an existent call and when it is impossible to assign a branchstructure or a communication frequency band, being the same as thebranch structure or the communication frequency band for the existentcall, to the new call, the base station controller selects anotherbranch structure or another communication frequency band which cancontinue both of the existent and new calls, and assigns the selectedbranch structure or communication frequency band to both of the existentand new calls.
 70. A branch controlling method adapted for a mobilestation, characterized in that when a trigger of handover occurs to themobile station which is treating a plurality of calls, a branchstructure or a communication frequency band which can continue all ofthe calls is selected, and the selected branch structure orcommunication frequency band is assigned to all of the calls commonly.71. A mobile station capable of treating a plurality of callssimultaneously, characterized in that when a trigger of handover occursto the mobile station which is treating a plurality of calls, the mobilestation, according to an instruction from a network, alters a branchstructure or a communication frequency band for all of the calls to anew branch structure or a new communication frequency band for all ofthe calls commonly.
 72. A base station controller adapted for a mobilestation, characterized in that when a trigger of handover occurs to themobile station which is treating a plurality of calls, the base stationcontroller selects a branch structure or a communication frequency bandwhich can continue all of the calls, and assigns the selected branchstructure or communication frequency band to all of the calls commonly.73. A branch controlling method adapted for a mobile station,characterized in that when a trigger of handover occurs to the mobilestation which is treating a plurality of calls and when there is not abranch structure which can continue all of the calls in relation to themobile station or when there is not a communication frequency band whichcan continue all of the calls in relation to the mobile station, anotherbranch structure or another communication frequency band which cancontinue a plurality of calls being high in priority among the calls areselected; the other call or calls are released; and the selected branchstructure and communication frequency band are assigned to the prioritycalls.
 74. A mobile station characterized in that when a trigger ofhandover occurs to the mobile station which is treating a plurality ofcalls and when there is not a branch structure which can continue all ofthe calls in relation to the mobile station or when there is not acommunication frequency band which can continue all of the calls inrelation to the mobile station, the mobile station, according to aninstruction from a network, releases a call or calls being low inpriority; and assigns a branch structure and a communication frequencyband selected by the network to a plurality of calls being high inpriority.
 75. A base station controller adapted for a mobile station,characterized in that when a trigger of handover occurs to the mobilestation which is treating a plurality of calls and when there is not abranch structure which can continue all of the calls in relation to themobile station or there is not a communication frequency band which cancontinue all of the calls in relation to the mobile station, the basestation controller selects another branch structure and anothercommunication frequency band which can continue a plurality of callsbeing high in priority among the calls; releases the other call orcalls; and assigns the selected branch structure and communicationfrequency band to the priority calls. 76-81. (canceled)
 82. A handovercontrolling method for additionally establishing a handover branchbetween a mobile station and a network, characterized in that aprocedure for additional establishment of a branch is completed with astate transition to which the mobile station can commence communicatingwithout waiting for a confirmation of synchronization for all branches.83. A handover controlling method according to claim 82, wherein theprocedure for additional branch establishment is completed withconfirmation of synchronization for one branch among the branchesestablished for the mobile station.
 84. A mobile station characterizedin that if the mobile station has received a request from a network toestablish a new additional branch between the network and the mobilestation, the mobile station establishes the new branch and then startsdiversity reception upon reception of a signal through the new branch.85. A base station characterized in that if the base station hasreceived a request from a base station controller to establish a newadditional branch between a mobile station and the base station forcarrying out intra-cell diversity handover, the base stationadditionally establishes the new branch and then starts intra-celldiversity reception upon reception of a signal through the new branch.86. A base station characterized in that if the base station hasreceived a request from a base station controller to establish a newadditional branch between a mobile station and the base station forcarrying out inter-cell diversity handover, the base station establishesthe new branch and then starts sending the received signals to the basestation controller that executes inter-cell diversity reception uponreception of a signal through the new branch.
 87. A base stationcontroller characterized in that when the base station controllerestablishes a new additional branch between a mobile station and anetwork, the base station controller provides a request for establishingthe new branch and then completes a procedure for additionalestablishment of the new branch without a confirmation ofsynchronization for all branches between the mobile station and thenetwork.
 88. A base station controller according to claim 87, whereinthe base station controller provides the request for establishing thenew branch being necessary for inter-cell diversity handover, and thenstarts inter-cell diversity reception upon reception of signals throughthe branches being necessary for inter-cell diversity handover. 89-99.(canceled)